Of all the
possible
stimulus situations that could act as clues to potential danger and can be sensed at a distance, there are certain ones that are exploited by a very wide array of species.
Bowlby - Separation
0-4?
11
Situation N:b 21-33 28-45 7-14 %%%%
1 Left alone 12 16 7 0
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Proportions of children showing fear (categories 3 and 4) in experimental situationsa
responses
4? 0-4? 11 5? 0-5? 11 7-14 21-13
0
0
0
0
0
43
not tested
Situation
2. Loss of support 3. Dark passage 4. Strange person 5. High board
Age: 2? 0-2? 11 N:b 21-33
24 9 47 51 31 22 36 36 23 20 35 56 62 43
3? 0-3? 11 28-45
0
36
12
7
14
43
43
6. Loud sound
7. Snake
8. Large dog
aSource: Jersild & Holmes ( 1935a). bNumber of children varies by experiments.
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The proportion of children showing fear according
differs little when two-year-olds are compared with three-year-olds. After the fourth birthday, however, there is a marked reduction, which becomes particularly noticeable after the fifth birthday. Because, as remarked earlier, the experimental situations were presented to each child in the same order, it is difficult to be confident how they compare with each other in their fearinducing potential. The three situations that stand out in the series as being frightening to a high proportion of children up to the fifth birthday are nos. 3, 7, and 8: the dark passage, the snake, and the large dog. In each of these situations never less than one-third of the children refused to perform alone, and in certain groups more than half refused. When the children who were scored in category 2, having performed only after receiving reassurance and encouragement, are included the percentages range from about 50 to 80 per cent. And had the children who hesitated and performed with caution (category 1) been included also, an overwhelming majority would have been found to have exhibited some trace of fear in these three situations. Thus, even when the proviso about the effects of test order is borne in mind, the experiments go some way towards confirming a commonly held view that a very large proportion of young children are apt to be afraid of the dark and of animals.
The Findings in Relation to Age
A study of the data reviewed so far suggests that, if we leave aside fear of separation as a special problem, the whole medley of situations that can be observed to arouse fear in children during their first five years can be listed in four main categories, whose fear-arousing properties vary to some extent with the age of the children:
a. Noise and situations associated with noise; sudden change of illumination and sudden
unexpected movement; an object approaching; and height. These situations are especially 95
to these criteria in these experiments
liable to arouse fear during the first, second, and third years of life.
b. Strange people and familiar people in strange guise; strange objects and strange places.
Strangeness is especially liable to arouse fear during the last quarter of the first year -113-
and through the second and third years, and then tends to diminish.
c. Animals: not only did animals commonly elicit fear in children of each of the age-groups for which parents kept records (35 per cent in the second year and 40 per cent or above in the older children), but the presence of an animal was the experimental situation that aroused fear most frequently. All other relevant studies, some to be described shortly, also report a high incidence of fear of animals.
d. Darkness, especially being alone in the dark. Occurrences of fear in such situations were recorded by mothers for about 20 per cent of the children at each age-level, and, if anything, the incidence seems to rise with age. Furthermore, fear of the dark and of being alone in the dark was seen in about half the children tested in the experimental situations. Again, as with fear of animals, a high incidence of fear in these situations is reported in several other studies.
The situations listed in categories (a) and (b) above are simple and require little or no learning. They tend to elicit fear in the youngest children especially and to do so less as children get older. Those in categories (c) and (d) are more complex and may include some reference to potential events. The fear-inducing properties of these situations do not diminish during the early years of childhood; indeed, those of some situations tend to increase.
These conclusions regarding changes with age are based on the cross-sectional studies discussed so far, in which each agegroup comprises a distinct group of children. It is therefore reassuring to find that they are confirmed when a single group of children is followed longitudinally over a period of a year or more.
In another of their many studies Jersild & Holmes ( 1935b), relying on information from parents, compared changes in situations feared in a sample of forty-seven children (thirtythree aged initially three or four years and fourteen aged initially five or six years). The follow-up period varied between thirteen and thirty-five months for different children. As they got older, many children earlier reported to be afraid of noise, sudden change of stimulation, strangeness and strangers were reported as no longer afraid. Conversely, children who had earlier not been reported as afraid of the dark or of anticipated events, such as accidents or robbers, were later reported to have
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become so. These shifts are in keeping with a child's increasing, though still very limited, capacities for appraising current events in terms of their significance for the future, a topic considered further in Chapter 10.
A Note on Fear of Strangers
The tendency for something or someone strange to elicit fear has been much discussed. Whether fear is or is not aroused in a particular instance evidently turns on a great number of conditions that are still not fully understood. In his observations of toddlers in a park with mother (see p. 107 above), what impressed Anderson was that the presence of a passing
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stranger seemed to go almost unnoticed. On the other hand, in his discussions with mothers of another group of toddlers (see p. 108 above), he found that eight out of eighteen children were reported as having at some time shown fear of a stranger. This information was volunteered spontaneously by the mothers who had plainly been much struck by it. The most usual situation was when a relative or friend, well known to mother but perhaps little known to the child, visited. Unlike total strangers, who would naturally stay at a distance, relatives and friends are apt to approach mother and child enthusiastically, and mother herself reciprocates. It was in situations likely to have been of this kind that a number of the children had become very frightened. (Not infrequently, some unusual aspect of the visitor was picked upon -- spectacles, wrinkles, beard, or a loud voice. ) The conclusion to which Anderson's findings point is that what young children find especially frightening is the combination of strangeness and approach (cf. the findings of Morgan & Ricciuti ( 1969) described on p. 120 below).
If that conclusion is correct, it would go some way to explain why the children studied by Heinicke & Westheimer ( 1966) in a residential nursery so often showed fear of the observer (see Chapter 1 above, pp. 9 - 10 ). First, the children were without mother; second, the observer remained a relative stranger to them; third, the observer 'actively though cautiously approached the child to see how he would react'.
Fear of Animals and of the Dark
It is remarkable with what regularity being afraid of animals and of the dark is reported for children from the age of three years upwards. In the Macfarlane longitudinal study, for example, more than 90 per cent of the hundred children in the
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sample were reported by mother to have shown fear of some specific situation at one or another age during the period in which they were studied, which was from the age of twenty- one months to fourteen years. At each yearly examination up to the age of eleven years between one-third and one-half of the children were reported as having shown fear of a particular situation; and of the situations most frequently reported as feared, dogs and the dark were the commonest, especially in the younger age-groups ( Macfarlane, Allen & Honzik 1954). Comparable findings, also based on mothers' reports, are presented by Lapouse & Monk ( 1959) who made a crosssectional study of a representative sample of 482 children between the ages of six and twelve years in New York State.
Similar findings emerge again from two further studies conducted by Jersild. In one of them he and his colleagues interviewed some four hundred children between the ages of five and twelve years (twenty-five boys and twenty-five girls at each of eight age-levels). Starting each interview on neutral topics the interviewer went on to inquire of the child about the things that scared or frightened him. In a second, questionnaires were issued to some three hundred students and members of staff aged between seventeen and thirty-five years (mostly between eighteen and twenty-six). Subjects were asked to describe situations that had frightened them as children and to indicate which was the earliest they could remember, which they were most intensely afraid of, and which they were most persistently afraid of; a single situation might of course qualify under all three heads.
The situations that these adults recalled as having aroused fear were closely in line with those described by the five- to twelve-year-old children. In both groups fear of animals bulked
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large. Among the children it was clearly highest at the younger age-levels: fear of animals was described by 27 per cent of the five- and six-year-olds, by 22 per cent of the seven- and eightyear-olds, and by 11 per cent of the older children. Among the adults, about one in six reported fear of animals as the earliest fear they recalled, and /or the most intense and/or the most persistent.
Fear of the dark is frequently a mixture of being afraid when alone in the dark, especially of strange noises or other happenings, and being afraid of being attacked in the dark, perhaps by imaginary creatures, such as ghosts or characters out of story-books, or perhaps by burglars and kidnappers. Being
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afraid in such situations and ways was reported by about 20 per cent of the five- to twelve- year-olds, the incidence not changing greatly with age, and it was recalled also by about the same proportion of young adults; among the latter fear of the dark resembled fear of animals in being recollected as having been very intense and very persistent.
Fear of Damage, Illness, Death
In both series some 10 per cent of subjects reported or recalled being afraid of getting damaged in an accident or a fight, though fear of pain as such was rarely mentioned.
Fear of becoming ill or dying was conspicuous by its infrequency. It was mentioned by none of the 200 children under nine years of age and by only six of the 200 from nine to twelve. About 3 per cent of the young adults recalled fear of illness or death as their most intense or their most persistent fear. Absence of fear of death among children under ten is in keeping with Anthony's study reported in The Child's Discovery of Death ( 1940). After examining the steps by which a child gradually acquires the concept of death as an irreversible departure, Anthony concludes that death acquires its emotional significance through its equation with separation (see Appendix I, p. 384 n).
Fear of the illness or death of a parent was rarely mentioned by either the children or adults questioned by Jersild; the proportion was about 3 per cent in each group.
It is interesting to note how infrequently the situations observed most regularly to arouse fear during the first two or three years of life are referred to by the older children or recalled by the young adults. In neither series do more than 5 per cent of the subjects report or recall being afraid of noise, sudden movement, falling, strange objects or strange people--so long as it is light. During darkness, however, as already described, the position is very different.
Clinicians will inevitably be sceptical whether interviews, even if skilfully conducted, or questionnaires can possibly elicit from either children or young adults an accurate and comprehensive account of all the situations that frighten or have frightened them. The fact that the younger children (five- and six-year-olds) described fewer such situations than did the older ones suggests, indeed, that their accounts were especially inadequate. Nevertheless, though some fear-arousing situations
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98
were no doubt under-reported, it seems probable that such positive information as was given can be regarded as valid.
In this chapter all that is attempted is a description of the situations that commonly arouse fear in humans and a rough indication of how these situations tend to change as a child grows towards adulthood. Possible explanations of the findings are postponed until later chapters. Meanwhile there is more to be said about the situations themselves.
Compound situations
Again and again it is found that a child or adult is especially apt to be frightened in a situation characterized by two or more potentially alarming features; for example, a stranger who suddenly approaches, a strange dog that barks, an unexpected noise heard in the dark. Commenting on the records made by parents over a period of twenty-one days of situations that aroused fear in their children, Jersild & Holmes ( 1935a) note that two or more of the following features were frequently reported to have been present together: noise, strange people or surroundings, the dark, sudden and unexpected movement, and being alone. Whereas a situation characterized by a single one of these features might only alert, when there are several present together fear, more or less severe, may well be aroused.
Because the response to a combination of features is often dramatically greater than, or different from, what it is to any one singly, it is proposed to refer to such situations as 'compound', a term chosen to echo the chemical analogue.
We have seen that situations that are especially likely to elicit fear not only during childhood but during later years also are those involving animals and those involving darkness. Their fear-arousing property, it seems likely, is to be explained by the fact that both types of situation commonly constitute a source of two or more of the potentially alarming features already considered. A discussion of how fear responses to these two types of situation develop during the early years will be found at the end of Chapter 10.
Being Alone
The situational feature of special interest to us in this work is, of course, being alone. Probably nothing increases the likelihood that fear will be aroused more than that. Finding oneself alone in a strange place, perhaps in darkness, and met by a sudden movement or mysterious sound, few of us would be unafraid.
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Were we to have with us even one stout companion, however, we should probably feel much braver; and given many our courage would quickly return. Being alone, like conscience, 'doth make cowards of us all'.
The immense difference made to a child who is in a potentially frightening situation by the presence of an adult was, it will be noted, taken for granted by Jersild & Holmes when they devised their experiments. Not only was the experimenter present with the child in all of them (except the first), but the scoring system was based on the extent to which a child required encouragement or support from the experimenter in carrying out the task. Had the experimenter not been present, it is evident, a far higher proportion of children would have
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been scored as having been afraid than were so scored. This is shown by the fact that, of the children scored as not having shown fear, many had carried out the task, for example to find the ball down the dark passage or to pat the dog, only after they had been given much reassurance and encouragement from the experimenter. Furthermore, almost all of those who were scored as having shown fear, because despite encouragement they refused to carry out the task on their own, were ready to do so when the experimenter accompanied them.
These findings are so much in keeping with common experience that it may seem absurd to labour them. Yet there is abundant evidence that, when psychologists and psychiatrists come to theorize about fear and anxiety, the significance of these phenomena is gravely underestimated. The same is true of most psychoanalysts, with Freud a conspicuous exception.
Fear behaviour and the development of attachment
As long ago as 1920 Watson & Rayner reported that it was not possible to elicit fear responses, which had been conditioned to a white rat, in a small boy of eleven months, Albert, so long as he had his thumb in his mouth; and in 1929 English described how a little girl of fourteen months showed no fear of strange objects as long as she was in her familiar high chair, though she became afraid of them when she was placed on the floor.
Others of these early workers also note the phenomenon. Valentine ( 1930) remarks that 'the presence of a companion is a well-known banisher of fear'. Freud's view, as presented for example in the Three Essays ( 1905b, SE 7: 224) and quoted at the head of Chapter 3, is not very different. In more recent times Laughlin ( 1956) has proposed a new term, 'soteria', as an
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obverse of phobia, to denote the intense sense of reassuring comfort that a person may get from a 'love object', be it toy, charm, or talisman.
There is still much to be learnt about the extent to which, at different ages, the situation in which a child finds himself in relation to his attachment figure affects the way he responds to stimuli that are potentially fear-arousing. A step towards greater understanding comes from the findings of Morgan & Ricciuti ( 1969). In their developmental study offear of strangers they show that, during the first eight months of life, little difference is made to the form or intensity of response by whether an infant is seated on his mother's lap or on a chair a few feet from her. Thereafter, however, and especially from twelve months of age, proximity to mother becomes a most important variable.
Morgan & Ricciuti studied eighty infants, falling into five age-groups (four and a half, six and a half, eight and a half, ten and a half, and twelve and a half months). Each infant was tested for his response to a stranger (a) seated on mother's lap and (b) when seated in a little chair four feet from her. After entering, the stranger 1 behaved according to a regular routine. First he sat silent but smiling about six feet from the infant; next he spoke to the infant; then he moved quietly to a distance of about two feet, where he knelt and talked further; finally, he touched the infant's hand. After a half-minute pause, the stranger began his withdrawal, proceeding as before but in reverse order. The infant's behaviour was observed from behind a one-way screen. Positive marks were given for smiling, babbling, cooing, and reaching out towards the stranger; negative marks for frowning, pouting, fussing, whimpering, crying,
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turning towards mother, and avoiding or withdrawing from the experimenter. Sobering or merely looking at the stranger or mother scored zero.
Three-quarters of the infants in the two youngest age-groups (four and a half and six and a half months) responded warmly to the stranger by smiling, cooing, and reaching out; and whether they were seated on mother's lap or not made little difference. Only one showed signs of fear. Infants in each of the three older
____________________
1 Each infant was tested with two strangers, one male and one female. At each age-level
there was a tendency for the response to the male stranger to be less friendly and more fearful than that to the female. Whether this was due to the sex difference or to some other difference between them it is not possible to know.
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age-groups, however, were not only increasingly more likely to show fear but also increasingly more sensitive to mother's whereabouts. Thus, of those in the two intermediate agegroups (eight and a half and ten and a half months), a quarter withdrew or showed some other sign of fear; and of those aged twelve and a half months no fewer than half withdrew or were otherwise afraid. The effect of mother's whereabouts on the response was only just apparent in the two intermediate agegroups. In infants of twelve and a half months, however, it was abundantly clear. Only when seated on mother's lap did any of these one-year-olds welcome the stranger; when, by contrast, they were seated four feet from her, every one of them showed fear.
Rather similar findings are reported by Bronson (in press) from his short longitudinal study, referred to above (p. 100 ), of infants between three and nine months of age. He observed how the response to a stranger is influenced (a) by the infant's being held by mother and (b) by the infant's being able to see her.
At the age of four months there was little indication that being held by mother reduced wariness when the stranger approached to within two feet and called the baby. But by six and a half months being held by mother reduced wariness considerably and it did so at nine months also.
Presence of an infant's mother within sight, about four feet from him, made little difference to the degree of wariness of the stranger shown by the infant at four and a half or six and a half months. By the age of nine months, however, visual contact with mother was found to reduce wariness. Moreover, at that age it was not uncommon for a baby to crawl over to his mother when the stranger approached.
In the light of these findings it is instructive to consider afresh the much-quoted case of Albert on whom Watson & Rayner reported fifty years ago. In a series of experiments this eleven- month-old infant was conditioned to fear a white rat and, through generalization, a rabbit, a piece of seal fur, and human hair. The unconditioned stimulus was a loud noise made by hitting a long steel bar with a hammer just behind his head. Learning theorists have argued that many cases of phobia are to be traced to conditioning of this kind.
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Deductions drawn from the case have often been challenged (e. g. see Marks 1969). In the context of this work the following points deserve mention. First, Albert had been 'reared almost from birth in a hospital environment' and was selected for the
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experiment because he seemed so 'stolid and unemotional'. Second, the conditioning took place with Albert placed on a mattress on top of a small table, and with no familiar figure towards whom he could turn. Some of his responses, nevertheless, were those used by a child in turning to a mother figure: for example, raising his arms as if to be picked up and, later, burying his head in the mattress. In addition, Albert was very apt when upset to suck his thumb. To the experimenters this proved most inconvenient, since 'the moment the hand reached the mouth he became impervious to the stimuli producing fear. Again and again . . . we had to remove the thumb from his mouth before the conditioned response could be obtained. ' From these observations the experimenters themselves reached a very significant conclusion: 'the organism . . . apparently from birth, when under the influence of love stimuli, is blocked to all others. '
Thus the results of this early experiment by Watson & Rayner as well as those of the recent ones by Morgan & Ricciuti and by Bronson are consistent with the picture of the growth of attachment behaviour given in the first volume. They are consistent also with two findings by Schaffer described earlier in this one. The first (reported in Chapter 3) is that, before the age of twenty-eight weeks, infants do not protest when removed from mother to the strange surroundings of a hospital but that, from seven months onwards, they do so. The other finding (noted earlier in the present chapter) is that, whereas an infant of twelve months when confronted with strange objects refers constantly to his mother if she is seated behind him, an infant of six months appears oblivious of her being there.
Thus in general it can be said that, just as attachment to a mother figure is becoming steadily better organized during the latter half of the first year, so also is withdrawal from a feararousing situation. Furthermore, because by twelve months a child's cognitive equipment has developed sufficiently for him to be well able to take account of objects and situations briefly absent, he has become able so to organize his behaviour that he moves simultaneously both away from one type of situation and towards another type. Hence he enters his second year equipped to respond in the dual way that is typical of wellorganized fear behaviour. In the next chapter a description is given of how young monkeys pass through the same developmental phases but at a faster rate.
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Fear of Future Contingencies
In this chapter attention has been focused mainly on the nature of the immediate situations that can be observed to give rise to fear behaviour in children. Nevertheless, during the course of human life the situations that are apt to arouse fear include not only those that are actually present but others, more or less likely, that are forecast. Thus children and adults are frequently apprehensive about events that they believe may be going to occur and of objects and creatures that they suspect may be going to appear. Such fear is concerned with future contingencies.
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Because so many of the situations feared by humans are of that nature and because they bulk so very large in clinical work, it is necessary to examine them in some detail. This is done in Chapters 10 and 11, after the immediate situations that arouse fear behaviour have been considered in the light of the behaviour's biological function.
We turn now to consider what is known about situations that arouse fear in animals. -123-
Chapter 8 Situations that Arouse Fear in Animals
Natural clues to potential danger
Although the stimulus situations that arouse fear in other species are not identical with those that arouse fear in humans, there is much overlap. Overlaps are especially evident, moreover, in the case of the non-human primates, to which much of this chapter is given.
Ethologists take for granted that many of the stimulus situations that arouse fear in animals can be regarded as naturally occurring clues to events that constitute a potential danger to the species in question. This applies especially to situations that arouse fear on the first occasion that an individual encounters them.
Distance receptors are commonly employed for sensing these naturally occurring clues. Depending on the species, an animal may rely mainly on visual clues and receptors, mainly on auditory ones, or mainly on olfactory ones; or on any combination of them. 1 Only when the distance receptors have failed to detect potential dangers in time are the proximal receptors, those for touch and pain, called into action -- and by then it may be too late. Thus, in eliciting fear behaviour, distal clues and distance receptors play a crucial role.
Of all the possible stimulus situations that could act as clues to potential danger and can be sensed at a distance, there are certain ones that are exploited by a very wide array of species. Among the best known are strangeness and sudden approach, both of which regularly evoke fear responses in birds and mammals. Another is the 'visual cliff' to which young mammals of all species so far tested respond by taking avoiding action.
Situations of other kinds, by contrast, arouse fear responses in animals of only a few species; and sometimes, perhaps, of only one. For example, in some species of bird the sight of mammalian fur elicits fear responses; in others, the sight of a pair of staring eyes or of something falling from the sky. In some
____________________
1 For discussions of fear responses in animals see Tinbergen ( 1957), Marler & Hamilton (
1966), and Hinde ( 1970). -124-
species of night-flying moth the high-pitched echolocating calls of predator bats lead to instant flight or, alternatively, to 'catalepsy'. Thus, like drugs, the naturally occurring distal clues to potential danger can be classified into 'broad-spectrum' clues, to which animals of a
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wide array of species are sensitive, and 'narrow-spectrum' clues, to which animals of only one or a few species are sensitive.
Many of the alarm calls of birds and mammals act as broadspectrum clues since they are responded to with fear not only by members of the species that emits them but by members of other species as well. This is in part because the alarm calls of different species have come to resemble each other, presumably through a process of natural selection.
In a number of animal species olfactory stimuli, some of broad but many of narrow spectrum, are especially effective in eliciting fear behaviour. Such 'warning scents' arise from one of two sources: from enemies or from friends. On the one hand, as is well known, the scent of an approaching predator, man or wolf, can elicit fear responses in a broad array of grazing mammals, zebras, deer, and antelope. On the other, an 'alarm scent' emitted by an animal when frightened or wounded can elicit fear responses in other animals (exactly as an alarm call can), but in this case the effect is likely to be confined to members of its own species.
Thus animals of every species are born genetically biased so to develop that they respond with one or another form of fear behaviour whenever they sense a stimulus situation that serves as a naturally occurring clue to one of the particular dangers that beset members of their species. Since some categories of potential danger are common for a wide array of species, clues to them act as broad-spectrum clues. Since other potential dangers affect only a few species, clues to them are likely to be narrow-spectrum.
Just as in man the forms of behaviour that can conveniently be labelled as fear behaviour are diverse, so are they in nonhuman species. Responses include, on the one hand, crouching, curling up, freezing and taking cover, and, on the other, calling, escaping, and seeking proximity to companions. The precise response shown turns on many factors -- the animal's species, its sex and age, its physiological condition, and also the particular type of situation that has aroused the fear.
For example, Hinde ( 1970) reports a finding by Hogan that, in chicks, withdrawal occurs from stimuli at high intensity (and
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some others) whereas freezing is elicited by stimuli that are strange, novel, or surprising. Again, both Lorenz ( 1937) and Tinbergen ( 1957) have pointed out how, in many species of bird, distinctive situations can elicit distinctive sorts of response. The Burmese jungle fowl (and also the domestic chicken) possess two distinct warning calls uttered in response to the sight, respectively, of a flying raptor and a terrestrial predator. When heard by another fowl, the raptor-type warning call elicits a downwards escape, ending, where possible, beneath cover of some kind. When, by contrast, the predator-type warning call is heard a fowl takes off and flies into a tree. These distinctive types of behaviour in response to distinctive warning calls are further evidence that, as is indicated in Chapter 6, we are dealing, not with some single and comprehensive 'instinct of fear', but with a heterogeneous collection of interrelated forms of behaviour, each elicited by a slightly different set of causal conditions.
Fear behaviour, it has been emphasized, may not only remove an animal from situations of certain kinds but take it towards, or into, situations of other kinds. Depending on the warning call heard, a fowl flies into ground cover or into a tree. A form of behaviour shown by
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animals of a great many species, and one of especial interest to our thesis, is movement that takes an animal towards his companions. For example, when a peregrine is overhead, lapwings not only take flight but keep close together as a flock; starlings do the same. (By contrast, in the same situation partridges crouch close to the ground. ) Most of the group-living mammals also edge closer together when alarmed. Movement of this kind is particularly evident in young mammals which, with only few exceptions, habitually run to mother and stay close to her.
Let us return now to the situations that arouse fear. It is probable that all the examples of distant situations mentioned so far in this chapter are responded to by fear behaviour of one kind or another on the very first occasion that an individual of a particular species encounters them. In such cases no special opportunities for learning that the situation is potentially dangerous are required. In the case of other stimulus situations, however, the position is quite different. Only after the situation has become associated with some other clue to potential danger is a fear response aroused. A clue universally known to lead to such learnt associations, though not the only one, is pain.
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Pain receptors are proximal and therefore their role is in many ways different from that of the distal receptors. In the first place, pain receptors are usually called into action as a last resort and only when the distal receptors, or the fear responses they may have elicited, have failed to ensure the animal's withdrawal. In the second place, the sensation of pain leads commonly to immediate and urgent action. In the third place, the sensation of pain may well mean that the danger has already materialized. For these reasons it is easy to suppose that pain and danger are in some way identical, which of course is not the case (see next chapter), and thus to give pain far too great a prominence in theories of fear behaviour.
Because by being a proximal clue to potential danger pain is very late in acting, it is of great biological advantage to an animal to learn to recognize potentially painful situations from associated distal clues. The investigation of such learning has for long been a principal interest of experimental psychologists, and in consequence much is known about it. In particular, it has long been known from conditioning experiments in which a neutral stimulus is coupled with a painful one that, in a great variety of mammalian species, a fear response to a stimulus hitherto neutral is both quickly established and very hard to extinguish.
A high concentration of interest on the fear-arousing properties of pain, and on the learning to which it gives rise, has at times led to a neglect of the immensely important and prior role of distal clues and distal receptors, both in animals and in man. As a result it is not always realized that in many species a new distal clue to potential danger can be learnt as readily by watching how companions respond to it, and then copying them, as by its becoming associated with pain. In mammals, indeed, a principal means whereby new situations come to be categorized as potentially dangerous, and so to be responded to by fear behaviour, is that of copying older animals, especially parents. In no kinds of mammal does imitative behaviour of this sort play so large a part as it does in primates.
Fear behaviour of non-human primates
Some years ago, as a result of long experience with chimpanzees in captivity, Yerkes & Yerkes ( 1936) wrote: 'The stimulus characters which early and late are dominant in the
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determination of avoidance responses are: visual movement, intensity, abruptness, suddenness and rapidity of change in stimulus or
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stimulus complex. ' Although this description needs a little elaboration the nub of the matter is there.
Field Observations
Field observers of the primates are well aware that sudden noise or sudden movement is immediately effective in alarming their subjects and leading to their rapid disappearance. Describing her experiences in watching langur monkeys in the forests of India, Jay ( 1965) writes: 'Forest groups gradually became used to me and I could follow them at a distance of about 50 feet. However, if any sudden movement in the brush startled them, they immediately fled from sight. ' Sudden sounds have the same effect.
For a forest-dwelling species, such as the langur tends to be, safety lies anywhere in the tree- tops. For ground-living species, by contrast, safety may lie in only one special place. For example, in East Africa the home range of each band of olive baboons must contain at least one clump of tall trees to the tops of which the band retreats whenever alarmed and in which it sleeps ( DeVore & Hall 1965). Further north, in Ethiopia, family parties of the related species of Hamadryas baboon must live within reach of precipitous cliffs to which they similarly can retreat ( Kummer 1967). The location of their haven of safety is a supreme determinant of the behaviour of these animals: 'Where large predators such as lions are numerous . . . the absence of trees in some areas may deny baboons access to rich food sources when food items in general are scarce' ( DeVore & Hall 1965).
In the field studies of non-human primates so far published, systematic attention is not always given either to the situations that evoke fear behaviour or to the forms that the behaviour commonly takes. The long-term study of wild chimpanzees undertaken in Tanzania by van Lawick-Goodall ( 1968) presents far more detail than most.
Van Lawick-Goodall starts by emphasizing that the form that fear behaviour takes 'depends on the situation and the individual or individuals concerned'. When a chimpanzee is startled by a sudden noise or movement nearby, its immediate response is to duck its head and to fling one or both arms across its face; alternatively, it may throw both hands in the air. Occasionally these startle reactions are followed by a hittingaway movement with the back of the hand towards the object, at other times by flight. When the alarming object is another
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and more dominant chimpanzee, flight is accompanied by loud screaming; when it is anything else, flight is quite silent. An alternative to flight is cautious withdrawal out of sight, combined with an occasional peering-out to see what is going on.
The situations van Lawick-Goodall reports as having evoked startle responses involved sudden noise or movement, for example a low-flying bird, a large insect, or a snake. Fear responses were very often aroused in a chimpanzee when another, more dominant, animal was making threatening gestures. Before the chimpanzees got used to her presence the observer
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herself was a common source of both fear and flight. After a year or so many of them carried on their normal activities when she was as close as thirty to fifty feet from them. Nevertheless, they quickly became uneasy if she began to follow them; often, too, she had to conceal her interest in them by diversionary activity, such as pretending to eat leaves or to dig.
Since so many species of animal give an alarm call when frightened, van Lawick-Goodall was surprised that the chimpanzees she studied never did so (except when fleeing from one of their own kind). Instead, each one moved away silently on its own. Nevertheless, they were quick to be alerted by the alarm calls of other species: they 'were invariably alerted by the alarm barks of baboons and also by the alarm calls of other monkeys, of bush buck and of some species of birds; after hearing such calls, they peered round to ascertain the nature of the disturbance'.
As in so many other species, to move away from an alarming situation or event is, in chimpanzees, only half the picture of fear behaviour. The other half is to move towards some place treated as though safe or to make physical contact with companions. The latter was seen in adults as well as in young. Van LawickGoodall describes how adult animals when frightened move towards and hug one another. This behaviour she believes to be a direct extension of what is seen so regularly in the infant:
Thus a mature chimpanzee may embrace, reach out to touch, or mount another animal under similar circumstances and in more or less the same manner as a frightened or apprehensive infant runs to embrace or be embraced by its mother, reaches out to grasp or touch her hair, or stands upright behind her grasping her rump . . . ready to climb on if the situation warrants it.
The calming and reassuring effects of contact with another
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animal are discussed by van Lawick-Goodall in some detail. A touch, a pat, or an embrace from a dominant animal was quickly effective in calming a subordinate, and occasionally the reverse occurred. One mature male was seen to find comfort by embracing a female only three years old, once when he had a sudden fright from seeing his own reflection in a glass and twice after he had been attacked by another male.
Field observers of other primate species have also noted the strong propensity of a frightened or agitated animal to touch or cling to a companion. For example, in his description of the behaviour of wild Hamadryas baboons, which live in stable family units of one male with up to three females and their young, Kummer ( 1967) remarks that not only infants but adults also when under stress are strongly disposed to cling to a companion. Thus an adult female, when alarmed, clings to the back of her husband or is embraced by him. Conversely, when he is under stress during a fight, a male is likely to embrace one of his wives. When an animal that has left its mother but is still not fully mature becomes frightened it seeks out the highest- ranking individual within range. Since not infrequently it is the threats of this animal that aroused the fear in the younger animal the result is paradoxical: the young animal runs to and clings to the very individual that aroused its fear. Among many interesting features of Kummer's study is the evidence he presents that in this species the relationship of a mated male and female is patterned closely on the relationship of a mother and her infant.
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The persistence into adult life of patterns of behaviour seen first and at greatest intensity during infancy is found, then, to be a regular feature of the behavioural repertoire of other primate species. It warns us against supposing that, whenever something similar is observed in humans, as it so often is, it must be treated as an example of regression.
In wild animals it is never possible to be sure whether an individual would respond to a particular situation with fear were it to encounter it for the first time or whether it does so only after having learnt to do so. Fear of snakes is a case in point. Van Lawick-Goodall reports that the wild chimpanzees she observed showed fear both of a fast-moving snake and of a dying python. Yet it seems that chimpanzees brought up in zoos do not always show such fear. 1
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1 A great many zoologists, including Charles Darwin, have been interested in the marked
tendency for monkeys and apes to respond to -130-
Apparently incompatible findings of this kind are not difficult to reconcile. In a social species, to respond with fear to a situation, once learnt, is handed on by tradition. This point is well illustrated by an observation made in Nairobi Park ( Washburn & Hamburg 1965). A large band of some eighty olive baboons were sufficiently tame to be approached easily in a car. Two of these baboons were then shot (by a local parasitologist). Thenceforward the baboons fled on sight of man or car, and eight months later they still could not be approached although they had seen 'harmless' cars almost daily during the interval. This example is in keeping with the common finding that a response learnt as a result of a single violent experience does not extinguish quickly. It illustrates, further, that it is not necessary for more than a few animals in a band actually to have been exposed to the alarming experience, since it is customary for all the animals in a band to flee as soon as they either hear an alarm bark or see a dominant animal running off. Thus, by following a tradition once set by their elders, members of a band may for years treat whatever happens to have frightened one of their number, present or past, as potentially dangerous. By these means, a tradition that snakes, or men, or cars are to be avoided may develop and persist in one social group though not in another.
Until recent years there was a tendency to suppose that maintenance within a social group from generation to generation of special ways of behaving was a skill confined to man. Now it is recognized that cultural traditions occur also in many other species and affect many forms of behaviour: how to sing ( Thorpe 1956), what to eat ( Kawamura 1963), where to nest ( Wynne-Edwards 1962). It is no surprise, then, to find that in a bird or mammal species cultural traditions exist regarding what to avoid.
The part played in human development by culturally determined clues to potential danger is discussed further in Chapter 10. Here it may be noted that recent experimental studies of monkeys demonstrate clearly that an animal may
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snakes by strong fear, often amounting to panic, and many observations are on record. The evidence is reviewed by Morris & Morris ( 1965), who also record striking observations of their own. While some measure of learning cannot be ruled out, it is evident that in old- world monkeys and apes the tendency to fear snakes is very pronounced, is relatively specific and, if learnt, is remarkably long-lived in the absence of any further experience.
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learn to fear a situation solely by observing how a companion responds. For example, Bandura ( 1968) refers to a study by Crooks which shows that monkeys that initially played freely with certain play objects ceased to do so after they had witnessed another monkey (apparently) emit cries of fear whenever it touched one of the objects. 1
Experimental Studies
Many other studies of captive animals, including experimental studies, fill out our knowledge of the fear behaviour of nonhuman primates and of the situations that are likely to evoke it.
Two visual situations that arouse fear in young rhesus monkeys are a looming stimulus and the visual cliff. Both experimental situations are described in the previous chapter where the fear responses of human infants are discussed.
Schiff, Caviness & Gibson ( 1962) studied the behaviour of twenty-three rhesus monkeys of varying age when confronted by a looming stimulus; eight were infants of between five and eight months, and the remainder adolescent or adult. Each animal was tested alone in its own cage at a distance of five feet from the screen on to which the expanding (looming) shadow was projected. All but four of the animals responded immediately by either withdrawing or ducking. A number of animals sprang to the rear of the cage, often bumping hard against the back. Other and less active animals were quick to duck head and upper part of body. Younger animals often gave alarm calls as well. (The four animals that failed to respond were thought to be looking elsewhere when the stimulus was presented. ) No age differences were shown. The speed and form of the stimulus appeared irrelevant. No habituation occurred when two animals were each exposed to a series of fifteen looming trials at intervals of ten seconds.
When the same animals were confronted by a contracting (receding) shadow the response was quite different. All but four remained at the front of the cage and appeared interested as the shadow contracted. A general brightening of the screen also aroused interest. A darkening screen produced no particular response, except when it was presented after a looming stimulus: then it produced a few slight flinches, much milder than those that occurred to looming.
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1 In fact the distress vocalizations were played on a tape-recorder each time the monkey
touched an object. -132-
The number of young rhesus monkeys tested on the visual cliff is few, but responses are unambiguous. Walk & Gibson ( 1961) report on a male infant tested at ten days, and again at eighteen and forty-five days, and on a female infant tested at twelve and thirty-five days. During their second week both infants proved only fairly reliable in avoiding the 'chasm'. By the ages of eighteen and thirty-five days, respectively, the two showed pronounced discrimination and effectively avoided the 'deep' side at every test. Thus, in this species, avoidance of the deep side is only partly efficient when locomotion begins, but it improves rapidly. The results of similar experiments on another small sample of rhesus infants, reported by Fantz ( 1965), are of a similar kind.
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Strangeness has been used as a fear-arousing stimulus in many experiments with primates.
Harlow and his colleagues have conducted a number of experiments on the fear behaviour of young rhesus monkeys. 1 Before about twenty days of age an infant rhesus shows no sign of fear of strange visual stimuli; for example, it will confidently approach a moving toy animal it has never seen before. After that age, however, and especially after six weeks, the presence of such a toy leads an infant immediately to rush away from it. Infants that have been reared on a cloth dummy 'mother' not only flee from the alarming toy but return promptly to the familiar dummy mother, to which they then cling tightly. Often a rather older infant, of twelve weeks or more, having fled from the alarming toy and clung tightly to its familiar dummy mother, relaxes. Then it may leave the dummy mother and cautiously approach the fear-inducing toy; it may even explore it manually. The behaviour of the same infant when its familiar dummy mother is absent is, however, very different. It is likely then to curl up on the floor and scream (see below, p. 135 ).
Mason ( 1965) has carried out rather similar experiments with chimpanzees, also using strangeness as a main form of feararousing stimulus situation. In this species also behaviour is very different according to whether an animal is with others or alone. This leads to a consideration of the effects on nonhuman primates of compound situations, and especially of the striking effects of being alone.
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1 An account of some of Harlow's experiments is given in Volume I, Chapter 12. See also
Harlow & Zimmermann ( 1959); Harlow ( 1961); Harlow & Harlow ( 1965). -133-
Compound situations
Monkeys and apes are like humans in that, when confronted by a situation compounded of more than one alarming feature, they are apt to exhibit fear at an intensity far greater than they would were any one of the features to be present singly. Being alone in the presence of a fear- inducing stimulus, moreover, greatly intensifies the fear behaviour seen.
Being Alone
An experimental study reported by Rowell & Hinde ( 1963) gives quantitative data for a sample of seventeen rhesus monkeys, thirteen adult (three male and ten female) and four subadult (two of each sex). These animals live together in stable groups of a male with three or four females and young. The tests, each of which lasted for three minutes, consisted of very simple situations. In each test the tester, who was well known to the animals, stood close to the cage. In one he offered them pieces of banana; in another he stood quietly watching but not staring; and in a third he dressed up in mask and cloak and made slight movements. Before being tested each animal was observed for half an hour and its behaviour was recorded. Thereafter the three tests followed, separated by intervals of five minutes.
In the first series of tests the animals were tested while living together in their regular groups. Each time the tester appeared they showed a characteristic change in behaviour compared with what they had shown before the testing started. There was a great increase of threat noises and of activities, such as lipsmacking, scratching, and yawning, that are associated with
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stress. In addition, they urinated more frequently, their hair stood on end, and they showed a frightened facial expression. (Attacks were sometimes made by the adult males towards the tester but were not made by the other monkeys. )
Most of these forms of behaviour were considerably more in evidence when the observer wore the mask and cloak and moved than when he stood quietly by. Of responses seen in the mask test, significant increases in frequency were recorded for low aggression threat noises, hair standing on end, urinating, frightened expression, and yawning. In general terms it seems that, whereas the monkeys were merely 'made uneasy' when the observer quietly watched, when he wore the mask they became 'alarmed and angry'.
In a second series of tests each animal was tested alone. For
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a period of six hours before testing began the remainder of its group was locked into an indoor cage while the animal under test remained alone in its familiar outdoor cage; it could, however, hear its companions and see them through a window, so that it was far from being isolated. Nevertheless, for every animal, fear responses to the simple tests were far more frequent when it was alone than when it was with its group. Increased scores ranged from threefold to fiftyfold. The response showing the greatest increase in frequency was that of looking into the window where it could see its absent companions.
Summing up their findings, Rowell & Hinde write:
Thus isolation is best regarded not merely as an additional stress-producing factor acting equally under all circumstances, but rather as one which, while producing relatively little effect on undisturbed animals, can strongly accentuate the effect of other stress-producing agents. It is as though isolation multiplied their effects, rather than summating with them.
The results of Harlow's experiments on young rhesus monkeys brought up on dummy mothers strongly support this conclusion ( Harlow & Harlow 1965). In one series of experiments four infants raised on cloth dummy mothers were introduced, singly, to a strange 'room', six feet square, containing various objects known to be of interest to young monkeys. Each week two tests were given to each infant. In one the infant's dummy mother was present in the 'room', in the other it was absent. According to whether its dummy mother was present or absent the behaviour of an infant was utterly different.
When the dummy mother was present an infant, on entry to the strange room, rushed to it and clutched it tenaciously. The infant then relaxed and, showing little sign of apprehension, began climbing over the dummy mother and manipulating it. After several such sessions, the infants began to use the dummy mother as a base from which to explore. Leaving the dummy, an infant moved to a toy, picked it up and handled it, and then moved back to the dummy. Sometimes a monkey would bring its plaything with it. Exploration of an object away from the dummy mother alternated with rapid return to base. Throughout, the monkey seemed relaxed and confident.
In the absence of the familiar dummy mother, behaviour was radically changed. An infant either curled up on the floor rocking and crying, or else ran around clutching hold of itself.
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Exploration of the objects, when it occurred at all, was 'brief, erratic and frantic'.
Situation N:b 21-33 28-45 7-14 %%%%
1 Left alone 12 16 7 0
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Proportions of children showing fear (categories 3 and 4) in experimental situationsa
responses
4? 0-4? 11 5? 0-5? 11 7-14 21-13
0
0
0
0
0
43
not tested
Situation
2. Loss of support 3. Dark passage 4. Strange person 5. High board
Age: 2? 0-2? 11 N:b 21-33
24 9 47 51 31 22 36 36 23 20 35 56 62 43
3? 0-3? 11 28-45
0
36
12
7
14
43
43
6. Loud sound
7. Snake
8. Large dog
aSource: Jersild & Holmes ( 1935a). bNumber of children varies by experiments.
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The proportion of children showing fear according
differs little when two-year-olds are compared with three-year-olds. After the fourth birthday, however, there is a marked reduction, which becomes particularly noticeable after the fifth birthday. Because, as remarked earlier, the experimental situations were presented to each child in the same order, it is difficult to be confident how they compare with each other in their fearinducing potential. The three situations that stand out in the series as being frightening to a high proportion of children up to the fifth birthday are nos. 3, 7, and 8: the dark passage, the snake, and the large dog. In each of these situations never less than one-third of the children refused to perform alone, and in certain groups more than half refused. When the children who were scored in category 2, having performed only after receiving reassurance and encouragement, are included the percentages range from about 50 to 80 per cent. And had the children who hesitated and performed with caution (category 1) been included also, an overwhelming majority would have been found to have exhibited some trace of fear in these three situations. Thus, even when the proviso about the effects of test order is borne in mind, the experiments go some way towards confirming a commonly held view that a very large proportion of young children are apt to be afraid of the dark and of animals.
The Findings in Relation to Age
A study of the data reviewed so far suggests that, if we leave aside fear of separation as a special problem, the whole medley of situations that can be observed to arouse fear in children during their first five years can be listed in four main categories, whose fear-arousing properties vary to some extent with the age of the children:
a. Noise and situations associated with noise; sudden change of illumination and sudden
unexpected movement; an object approaching; and height. These situations are especially 95
to these criteria in these experiments
liable to arouse fear during the first, second, and third years of life.
b. Strange people and familiar people in strange guise; strange objects and strange places.
Strangeness is especially liable to arouse fear during the last quarter of the first year -113-
and through the second and third years, and then tends to diminish.
c. Animals: not only did animals commonly elicit fear in children of each of the age-groups for which parents kept records (35 per cent in the second year and 40 per cent or above in the older children), but the presence of an animal was the experimental situation that aroused fear most frequently. All other relevant studies, some to be described shortly, also report a high incidence of fear of animals.
d. Darkness, especially being alone in the dark. Occurrences of fear in such situations were recorded by mothers for about 20 per cent of the children at each age-level, and, if anything, the incidence seems to rise with age. Furthermore, fear of the dark and of being alone in the dark was seen in about half the children tested in the experimental situations. Again, as with fear of animals, a high incidence of fear in these situations is reported in several other studies.
The situations listed in categories (a) and (b) above are simple and require little or no learning. They tend to elicit fear in the youngest children especially and to do so less as children get older. Those in categories (c) and (d) are more complex and may include some reference to potential events. The fear-inducing properties of these situations do not diminish during the early years of childhood; indeed, those of some situations tend to increase.
These conclusions regarding changes with age are based on the cross-sectional studies discussed so far, in which each agegroup comprises a distinct group of children. It is therefore reassuring to find that they are confirmed when a single group of children is followed longitudinally over a period of a year or more.
In another of their many studies Jersild & Holmes ( 1935b), relying on information from parents, compared changes in situations feared in a sample of forty-seven children (thirtythree aged initially three or four years and fourteen aged initially five or six years). The follow-up period varied between thirteen and thirty-five months for different children. As they got older, many children earlier reported to be afraid of noise, sudden change of stimulation, strangeness and strangers were reported as no longer afraid. Conversely, children who had earlier not been reported as afraid of the dark or of anticipated events, such as accidents or robbers, were later reported to have
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become so. These shifts are in keeping with a child's increasing, though still very limited, capacities for appraising current events in terms of their significance for the future, a topic considered further in Chapter 10.
A Note on Fear of Strangers
The tendency for something or someone strange to elicit fear has been much discussed. Whether fear is or is not aroused in a particular instance evidently turns on a great number of conditions that are still not fully understood. In his observations of toddlers in a park with mother (see p. 107 above), what impressed Anderson was that the presence of a passing
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stranger seemed to go almost unnoticed. On the other hand, in his discussions with mothers of another group of toddlers (see p. 108 above), he found that eight out of eighteen children were reported as having at some time shown fear of a stranger. This information was volunteered spontaneously by the mothers who had plainly been much struck by it. The most usual situation was when a relative or friend, well known to mother but perhaps little known to the child, visited. Unlike total strangers, who would naturally stay at a distance, relatives and friends are apt to approach mother and child enthusiastically, and mother herself reciprocates. It was in situations likely to have been of this kind that a number of the children had become very frightened. (Not infrequently, some unusual aspect of the visitor was picked upon -- spectacles, wrinkles, beard, or a loud voice. ) The conclusion to which Anderson's findings point is that what young children find especially frightening is the combination of strangeness and approach (cf. the findings of Morgan & Ricciuti ( 1969) described on p. 120 below).
If that conclusion is correct, it would go some way to explain why the children studied by Heinicke & Westheimer ( 1966) in a residential nursery so often showed fear of the observer (see Chapter 1 above, pp. 9 - 10 ). First, the children were without mother; second, the observer remained a relative stranger to them; third, the observer 'actively though cautiously approached the child to see how he would react'.
Fear of Animals and of the Dark
It is remarkable with what regularity being afraid of animals and of the dark is reported for children from the age of three years upwards. In the Macfarlane longitudinal study, for example, more than 90 per cent of the hundred children in the
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sample were reported by mother to have shown fear of some specific situation at one or another age during the period in which they were studied, which was from the age of twenty- one months to fourteen years. At each yearly examination up to the age of eleven years between one-third and one-half of the children were reported as having shown fear of a particular situation; and of the situations most frequently reported as feared, dogs and the dark were the commonest, especially in the younger age-groups ( Macfarlane, Allen & Honzik 1954). Comparable findings, also based on mothers' reports, are presented by Lapouse & Monk ( 1959) who made a crosssectional study of a representative sample of 482 children between the ages of six and twelve years in New York State.
Similar findings emerge again from two further studies conducted by Jersild. In one of them he and his colleagues interviewed some four hundred children between the ages of five and twelve years (twenty-five boys and twenty-five girls at each of eight age-levels). Starting each interview on neutral topics the interviewer went on to inquire of the child about the things that scared or frightened him. In a second, questionnaires were issued to some three hundred students and members of staff aged between seventeen and thirty-five years (mostly between eighteen and twenty-six). Subjects were asked to describe situations that had frightened them as children and to indicate which was the earliest they could remember, which they were most intensely afraid of, and which they were most persistently afraid of; a single situation might of course qualify under all three heads.
The situations that these adults recalled as having aroused fear were closely in line with those described by the five- to twelve-year-old children. In both groups fear of animals bulked
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large. Among the children it was clearly highest at the younger age-levels: fear of animals was described by 27 per cent of the five- and six-year-olds, by 22 per cent of the seven- and eightyear-olds, and by 11 per cent of the older children. Among the adults, about one in six reported fear of animals as the earliest fear they recalled, and /or the most intense and/or the most persistent.
Fear of the dark is frequently a mixture of being afraid when alone in the dark, especially of strange noises or other happenings, and being afraid of being attacked in the dark, perhaps by imaginary creatures, such as ghosts or characters out of story-books, or perhaps by burglars and kidnappers. Being
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afraid in such situations and ways was reported by about 20 per cent of the five- to twelve- year-olds, the incidence not changing greatly with age, and it was recalled also by about the same proportion of young adults; among the latter fear of the dark resembled fear of animals in being recollected as having been very intense and very persistent.
Fear of Damage, Illness, Death
In both series some 10 per cent of subjects reported or recalled being afraid of getting damaged in an accident or a fight, though fear of pain as such was rarely mentioned.
Fear of becoming ill or dying was conspicuous by its infrequency. It was mentioned by none of the 200 children under nine years of age and by only six of the 200 from nine to twelve. About 3 per cent of the young adults recalled fear of illness or death as their most intense or their most persistent fear. Absence of fear of death among children under ten is in keeping with Anthony's study reported in The Child's Discovery of Death ( 1940). After examining the steps by which a child gradually acquires the concept of death as an irreversible departure, Anthony concludes that death acquires its emotional significance through its equation with separation (see Appendix I, p. 384 n).
Fear of the illness or death of a parent was rarely mentioned by either the children or adults questioned by Jersild; the proportion was about 3 per cent in each group.
It is interesting to note how infrequently the situations observed most regularly to arouse fear during the first two or three years of life are referred to by the older children or recalled by the young adults. In neither series do more than 5 per cent of the subjects report or recall being afraid of noise, sudden movement, falling, strange objects or strange people--so long as it is light. During darkness, however, as already described, the position is very different.
Clinicians will inevitably be sceptical whether interviews, even if skilfully conducted, or questionnaires can possibly elicit from either children or young adults an accurate and comprehensive account of all the situations that frighten or have frightened them. The fact that the younger children (five- and six-year-olds) described fewer such situations than did the older ones suggests, indeed, that their accounts were especially inadequate. Nevertheless, though some fear-arousing situations
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98
were no doubt under-reported, it seems probable that such positive information as was given can be regarded as valid.
In this chapter all that is attempted is a description of the situations that commonly arouse fear in humans and a rough indication of how these situations tend to change as a child grows towards adulthood. Possible explanations of the findings are postponed until later chapters. Meanwhile there is more to be said about the situations themselves.
Compound situations
Again and again it is found that a child or adult is especially apt to be frightened in a situation characterized by two or more potentially alarming features; for example, a stranger who suddenly approaches, a strange dog that barks, an unexpected noise heard in the dark. Commenting on the records made by parents over a period of twenty-one days of situations that aroused fear in their children, Jersild & Holmes ( 1935a) note that two or more of the following features were frequently reported to have been present together: noise, strange people or surroundings, the dark, sudden and unexpected movement, and being alone. Whereas a situation characterized by a single one of these features might only alert, when there are several present together fear, more or less severe, may well be aroused.
Because the response to a combination of features is often dramatically greater than, or different from, what it is to any one singly, it is proposed to refer to such situations as 'compound', a term chosen to echo the chemical analogue.
We have seen that situations that are especially likely to elicit fear not only during childhood but during later years also are those involving animals and those involving darkness. Their fear-arousing property, it seems likely, is to be explained by the fact that both types of situation commonly constitute a source of two or more of the potentially alarming features already considered. A discussion of how fear responses to these two types of situation develop during the early years will be found at the end of Chapter 10.
Being Alone
The situational feature of special interest to us in this work is, of course, being alone. Probably nothing increases the likelihood that fear will be aroused more than that. Finding oneself alone in a strange place, perhaps in darkness, and met by a sudden movement or mysterious sound, few of us would be unafraid.
-118-
Were we to have with us even one stout companion, however, we should probably feel much braver; and given many our courage would quickly return. Being alone, like conscience, 'doth make cowards of us all'.
The immense difference made to a child who is in a potentially frightening situation by the presence of an adult was, it will be noted, taken for granted by Jersild & Holmes when they devised their experiments. Not only was the experimenter present with the child in all of them (except the first), but the scoring system was based on the extent to which a child required encouragement or support from the experimenter in carrying out the task. Had the experimenter not been present, it is evident, a far higher proportion of children would have
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been scored as having been afraid than were so scored. This is shown by the fact that, of the children scored as not having shown fear, many had carried out the task, for example to find the ball down the dark passage or to pat the dog, only after they had been given much reassurance and encouragement from the experimenter. Furthermore, almost all of those who were scored as having shown fear, because despite encouragement they refused to carry out the task on their own, were ready to do so when the experimenter accompanied them.
These findings are so much in keeping with common experience that it may seem absurd to labour them. Yet there is abundant evidence that, when psychologists and psychiatrists come to theorize about fear and anxiety, the significance of these phenomena is gravely underestimated. The same is true of most psychoanalysts, with Freud a conspicuous exception.
Fear behaviour and the development of attachment
As long ago as 1920 Watson & Rayner reported that it was not possible to elicit fear responses, which had been conditioned to a white rat, in a small boy of eleven months, Albert, so long as he had his thumb in his mouth; and in 1929 English described how a little girl of fourteen months showed no fear of strange objects as long as she was in her familiar high chair, though she became afraid of them when she was placed on the floor.
Others of these early workers also note the phenomenon. Valentine ( 1930) remarks that 'the presence of a companion is a well-known banisher of fear'. Freud's view, as presented for example in the Three Essays ( 1905b, SE 7: 224) and quoted at the head of Chapter 3, is not very different. In more recent times Laughlin ( 1956) has proposed a new term, 'soteria', as an
-119-
obverse of phobia, to denote the intense sense of reassuring comfort that a person may get from a 'love object', be it toy, charm, or talisman.
There is still much to be learnt about the extent to which, at different ages, the situation in which a child finds himself in relation to his attachment figure affects the way he responds to stimuli that are potentially fear-arousing. A step towards greater understanding comes from the findings of Morgan & Ricciuti ( 1969). In their developmental study offear of strangers they show that, during the first eight months of life, little difference is made to the form or intensity of response by whether an infant is seated on his mother's lap or on a chair a few feet from her. Thereafter, however, and especially from twelve months of age, proximity to mother becomes a most important variable.
Morgan & Ricciuti studied eighty infants, falling into five age-groups (four and a half, six and a half, eight and a half, ten and a half, and twelve and a half months). Each infant was tested for his response to a stranger (a) seated on mother's lap and (b) when seated in a little chair four feet from her. After entering, the stranger 1 behaved according to a regular routine. First he sat silent but smiling about six feet from the infant; next he spoke to the infant; then he moved quietly to a distance of about two feet, where he knelt and talked further; finally, he touched the infant's hand. After a half-minute pause, the stranger began his withdrawal, proceeding as before but in reverse order. The infant's behaviour was observed from behind a one-way screen. Positive marks were given for smiling, babbling, cooing, and reaching out towards the stranger; negative marks for frowning, pouting, fussing, whimpering, crying,
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turning towards mother, and avoiding or withdrawing from the experimenter. Sobering or merely looking at the stranger or mother scored zero.
Three-quarters of the infants in the two youngest age-groups (four and a half and six and a half months) responded warmly to the stranger by smiling, cooing, and reaching out; and whether they were seated on mother's lap or not made little difference. Only one showed signs of fear. Infants in each of the three older
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1 Each infant was tested with two strangers, one male and one female. At each age-level
there was a tendency for the response to the male stranger to be less friendly and more fearful than that to the female. Whether this was due to the sex difference or to some other difference between them it is not possible to know.
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age-groups, however, were not only increasingly more likely to show fear but also increasingly more sensitive to mother's whereabouts. Thus, of those in the two intermediate agegroups (eight and a half and ten and a half months), a quarter withdrew or showed some other sign of fear; and of those aged twelve and a half months no fewer than half withdrew or were otherwise afraid. The effect of mother's whereabouts on the response was only just apparent in the two intermediate agegroups. In infants of twelve and a half months, however, it was abundantly clear. Only when seated on mother's lap did any of these one-year-olds welcome the stranger; when, by contrast, they were seated four feet from her, every one of them showed fear.
Rather similar findings are reported by Bronson (in press) from his short longitudinal study, referred to above (p. 100 ), of infants between three and nine months of age. He observed how the response to a stranger is influenced (a) by the infant's being held by mother and (b) by the infant's being able to see her.
At the age of four months there was little indication that being held by mother reduced wariness when the stranger approached to within two feet and called the baby. But by six and a half months being held by mother reduced wariness considerably and it did so at nine months also.
Presence of an infant's mother within sight, about four feet from him, made little difference to the degree of wariness of the stranger shown by the infant at four and a half or six and a half months. By the age of nine months, however, visual contact with mother was found to reduce wariness. Moreover, at that age it was not uncommon for a baby to crawl over to his mother when the stranger approached.
In the light of these findings it is instructive to consider afresh the much-quoted case of Albert on whom Watson & Rayner reported fifty years ago. In a series of experiments this eleven- month-old infant was conditioned to fear a white rat and, through generalization, a rabbit, a piece of seal fur, and human hair. The unconditioned stimulus was a loud noise made by hitting a long steel bar with a hammer just behind his head. Learning theorists have argued that many cases of phobia are to be traced to conditioning of this kind.
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Deductions drawn from the case have often been challenged (e. g. see Marks 1969). In the context of this work the following points deserve mention. First, Albert had been 'reared almost from birth in a hospital environment' and was selected for the
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experiment because he seemed so 'stolid and unemotional'. Second, the conditioning took place with Albert placed on a mattress on top of a small table, and with no familiar figure towards whom he could turn. Some of his responses, nevertheless, were those used by a child in turning to a mother figure: for example, raising his arms as if to be picked up and, later, burying his head in the mattress. In addition, Albert was very apt when upset to suck his thumb. To the experimenters this proved most inconvenient, since 'the moment the hand reached the mouth he became impervious to the stimuli producing fear. Again and again . . . we had to remove the thumb from his mouth before the conditioned response could be obtained. ' From these observations the experimenters themselves reached a very significant conclusion: 'the organism . . . apparently from birth, when under the influence of love stimuli, is blocked to all others. '
Thus the results of this early experiment by Watson & Rayner as well as those of the recent ones by Morgan & Ricciuti and by Bronson are consistent with the picture of the growth of attachment behaviour given in the first volume. They are consistent also with two findings by Schaffer described earlier in this one. The first (reported in Chapter 3) is that, before the age of twenty-eight weeks, infants do not protest when removed from mother to the strange surroundings of a hospital but that, from seven months onwards, they do so. The other finding (noted earlier in the present chapter) is that, whereas an infant of twelve months when confronted with strange objects refers constantly to his mother if she is seated behind him, an infant of six months appears oblivious of her being there.
Thus in general it can be said that, just as attachment to a mother figure is becoming steadily better organized during the latter half of the first year, so also is withdrawal from a feararousing situation. Furthermore, because by twelve months a child's cognitive equipment has developed sufficiently for him to be well able to take account of objects and situations briefly absent, he has become able so to organize his behaviour that he moves simultaneously both away from one type of situation and towards another type. Hence he enters his second year equipped to respond in the dual way that is typical of wellorganized fear behaviour. In the next chapter a description is given of how young monkeys pass through the same developmental phases but at a faster rate.
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Fear of Future Contingencies
In this chapter attention has been focused mainly on the nature of the immediate situations that can be observed to give rise to fear behaviour in children. Nevertheless, during the course of human life the situations that are apt to arouse fear include not only those that are actually present but others, more or less likely, that are forecast. Thus children and adults are frequently apprehensive about events that they believe may be going to occur and of objects and creatures that they suspect may be going to appear. Such fear is concerned with future contingencies.
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Because so many of the situations feared by humans are of that nature and because they bulk so very large in clinical work, it is necessary to examine them in some detail. This is done in Chapters 10 and 11, after the immediate situations that arouse fear behaviour have been considered in the light of the behaviour's biological function.
We turn now to consider what is known about situations that arouse fear in animals. -123-
Chapter 8 Situations that Arouse Fear in Animals
Natural clues to potential danger
Although the stimulus situations that arouse fear in other species are not identical with those that arouse fear in humans, there is much overlap. Overlaps are especially evident, moreover, in the case of the non-human primates, to which much of this chapter is given.
Ethologists take for granted that many of the stimulus situations that arouse fear in animals can be regarded as naturally occurring clues to events that constitute a potential danger to the species in question. This applies especially to situations that arouse fear on the first occasion that an individual encounters them.
Distance receptors are commonly employed for sensing these naturally occurring clues. Depending on the species, an animal may rely mainly on visual clues and receptors, mainly on auditory ones, or mainly on olfactory ones; or on any combination of them. 1 Only when the distance receptors have failed to detect potential dangers in time are the proximal receptors, those for touch and pain, called into action -- and by then it may be too late. Thus, in eliciting fear behaviour, distal clues and distance receptors play a crucial role.
Of all the possible stimulus situations that could act as clues to potential danger and can be sensed at a distance, there are certain ones that are exploited by a very wide array of species. Among the best known are strangeness and sudden approach, both of which regularly evoke fear responses in birds and mammals. Another is the 'visual cliff' to which young mammals of all species so far tested respond by taking avoiding action.
Situations of other kinds, by contrast, arouse fear responses in animals of only a few species; and sometimes, perhaps, of only one. For example, in some species of bird the sight of mammalian fur elicits fear responses; in others, the sight of a pair of staring eyes or of something falling from the sky. In some
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1 For discussions of fear responses in animals see Tinbergen ( 1957), Marler & Hamilton (
1966), and Hinde ( 1970). -124-
species of night-flying moth the high-pitched echolocating calls of predator bats lead to instant flight or, alternatively, to 'catalepsy'. Thus, like drugs, the naturally occurring distal clues to potential danger can be classified into 'broad-spectrum' clues, to which animals of a
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wide array of species are sensitive, and 'narrow-spectrum' clues, to which animals of only one or a few species are sensitive.
Many of the alarm calls of birds and mammals act as broadspectrum clues since they are responded to with fear not only by members of the species that emits them but by members of other species as well. This is in part because the alarm calls of different species have come to resemble each other, presumably through a process of natural selection.
In a number of animal species olfactory stimuli, some of broad but many of narrow spectrum, are especially effective in eliciting fear behaviour. Such 'warning scents' arise from one of two sources: from enemies or from friends. On the one hand, as is well known, the scent of an approaching predator, man or wolf, can elicit fear responses in a broad array of grazing mammals, zebras, deer, and antelope. On the other, an 'alarm scent' emitted by an animal when frightened or wounded can elicit fear responses in other animals (exactly as an alarm call can), but in this case the effect is likely to be confined to members of its own species.
Thus animals of every species are born genetically biased so to develop that they respond with one or another form of fear behaviour whenever they sense a stimulus situation that serves as a naturally occurring clue to one of the particular dangers that beset members of their species. Since some categories of potential danger are common for a wide array of species, clues to them act as broad-spectrum clues. Since other potential dangers affect only a few species, clues to them are likely to be narrow-spectrum.
Just as in man the forms of behaviour that can conveniently be labelled as fear behaviour are diverse, so are they in nonhuman species. Responses include, on the one hand, crouching, curling up, freezing and taking cover, and, on the other, calling, escaping, and seeking proximity to companions. The precise response shown turns on many factors -- the animal's species, its sex and age, its physiological condition, and also the particular type of situation that has aroused the fear.
For example, Hinde ( 1970) reports a finding by Hogan that, in chicks, withdrawal occurs from stimuli at high intensity (and
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some others) whereas freezing is elicited by stimuli that are strange, novel, or surprising. Again, both Lorenz ( 1937) and Tinbergen ( 1957) have pointed out how, in many species of bird, distinctive situations can elicit distinctive sorts of response. The Burmese jungle fowl (and also the domestic chicken) possess two distinct warning calls uttered in response to the sight, respectively, of a flying raptor and a terrestrial predator. When heard by another fowl, the raptor-type warning call elicits a downwards escape, ending, where possible, beneath cover of some kind. When, by contrast, the predator-type warning call is heard a fowl takes off and flies into a tree. These distinctive types of behaviour in response to distinctive warning calls are further evidence that, as is indicated in Chapter 6, we are dealing, not with some single and comprehensive 'instinct of fear', but with a heterogeneous collection of interrelated forms of behaviour, each elicited by a slightly different set of causal conditions.
Fear behaviour, it has been emphasized, may not only remove an animal from situations of certain kinds but take it towards, or into, situations of other kinds. Depending on the warning call heard, a fowl flies into ground cover or into a tree. A form of behaviour shown by
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animals of a great many species, and one of especial interest to our thesis, is movement that takes an animal towards his companions. For example, when a peregrine is overhead, lapwings not only take flight but keep close together as a flock; starlings do the same. (By contrast, in the same situation partridges crouch close to the ground. ) Most of the group-living mammals also edge closer together when alarmed. Movement of this kind is particularly evident in young mammals which, with only few exceptions, habitually run to mother and stay close to her.
Let us return now to the situations that arouse fear. It is probable that all the examples of distant situations mentioned so far in this chapter are responded to by fear behaviour of one kind or another on the very first occasion that an individual of a particular species encounters them. In such cases no special opportunities for learning that the situation is potentially dangerous are required. In the case of other stimulus situations, however, the position is quite different. Only after the situation has become associated with some other clue to potential danger is a fear response aroused. A clue universally known to lead to such learnt associations, though not the only one, is pain.
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Pain receptors are proximal and therefore their role is in many ways different from that of the distal receptors. In the first place, pain receptors are usually called into action as a last resort and only when the distal receptors, or the fear responses they may have elicited, have failed to ensure the animal's withdrawal. In the second place, the sensation of pain leads commonly to immediate and urgent action. In the third place, the sensation of pain may well mean that the danger has already materialized. For these reasons it is easy to suppose that pain and danger are in some way identical, which of course is not the case (see next chapter), and thus to give pain far too great a prominence in theories of fear behaviour.
Because by being a proximal clue to potential danger pain is very late in acting, it is of great biological advantage to an animal to learn to recognize potentially painful situations from associated distal clues. The investigation of such learning has for long been a principal interest of experimental psychologists, and in consequence much is known about it. In particular, it has long been known from conditioning experiments in which a neutral stimulus is coupled with a painful one that, in a great variety of mammalian species, a fear response to a stimulus hitherto neutral is both quickly established and very hard to extinguish.
A high concentration of interest on the fear-arousing properties of pain, and on the learning to which it gives rise, has at times led to a neglect of the immensely important and prior role of distal clues and distal receptors, both in animals and in man. As a result it is not always realized that in many species a new distal clue to potential danger can be learnt as readily by watching how companions respond to it, and then copying them, as by its becoming associated with pain. In mammals, indeed, a principal means whereby new situations come to be categorized as potentially dangerous, and so to be responded to by fear behaviour, is that of copying older animals, especially parents. In no kinds of mammal does imitative behaviour of this sort play so large a part as it does in primates.
Fear behaviour of non-human primates
Some years ago, as a result of long experience with chimpanzees in captivity, Yerkes & Yerkes ( 1936) wrote: 'The stimulus characters which early and late are dominant in the
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determination of avoidance responses are: visual movement, intensity, abruptness, suddenness and rapidity of change in stimulus or
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stimulus complex. ' Although this description needs a little elaboration the nub of the matter is there.
Field Observations
Field observers of the primates are well aware that sudden noise or sudden movement is immediately effective in alarming their subjects and leading to their rapid disappearance. Describing her experiences in watching langur monkeys in the forests of India, Jay ( 1965) writes: 'Forest groups gradually became used to me and I could follow them at a distance of about 50 feet. However, if any sudden movement in the brush startled them, they immediately fled from sight. ' Sudden sounds have the same effect.
For a forest-dwelling species, such as the langur tends to be, safety lies anywhere in the tree- tops. For ground-living species, by contrast, safety may lie in only one special place. For example, in East Africa the home range of each band of olive baboons must contain at least one clump of tall trees to the tops of which the band retreats whenever alarmed and in which it sleeps ( DeVore & Hall 1965). Further north, in Ethiopia, family parties of the related species of Hamadryas baboon must live within reach of precipitous cliffs to which they similarly can retreat ( Kummer 1967). The location of their haven of safety is a supreme determinant of the behaviour of these animals: 'Where large predators such as lions are numerous . . . the absence of trees in some areas may deny baboons access to rich food sources when food items in general are scarce' ( DeVore & Hall 1965).
In the field studies of non-human primates so far published, systematic attention is not always given either to the situations that evoke fear behaviour or to the forms that the behaviour commonly takes. The long-term study of wild chimpanzees undertaken in Tanzania by van Lawick-Goodall ( 1968) presents far more detail than most.
Van Lawick-Goodall starts by emphasizing that the form that fear behaviour takes 'depends on the situation and the individual or individuals concerned'. When a chimpanzee is startled by a sudden noise or movement nearby, its immediate response is to duck its head and to fling one or both arms across its face; alternatively, it may throw both hands in the air. Occasionally these startle reactions are followed by a hittingaway movement with the back of the hand towards the object, at other times by flight. When the alarming object is another
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and more dominant chimpanzee, flight is accompanied by loud screaming; when it is anything else, flight is quite silent. An alternative to flight is cautious withdrawal out of sight, combined with an occasional peering-out to see what is going on.
The situations van Lawick-Goodall reports as having evoked startle responses involved sudden noise or movement, for example a low-flying bird, a large insect, or a snake. Fear responses were very often aroused in a chimpanzee when another, more dominant, animal was making threatening gestures. Before the chimpanzees got used to her presence the observer
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herself was a common source of both fear and flight. After a year or so many of them carried on their normal activities when she was as close as thirty to fifty feet from them. Nevertheless, they quickly became uneasy if she began to follow them; often, too, she had to conceal her interest in them by diversionary activity, such as pretending to eat leaves or to dig.
Since so many species of animal give an alarm call when frightened, van Lawick-Goodall was surprised that the chimpanzees she studied never did so (except when fleeing from one of their own kind). Instead, each one moved away silently on its own. Nevertheless, they were quick to be alerted by the alarm calls of other species: they 'were invariably alerted by the alarm barks of baboons and also by the alarm calls of other monkeys, of bush buck and of some species of birds; after hearing such calls, they peered round to ascertain the nature of the disturbance'.
As in so many other species, to move away from an alarming situation or event is, in chimpanzees, only half the picture of fear behaviour. The other half is to move towards some place treated as though safe or to make physical contact with companions. The latter was seen in adults as well as in young. Van LawickGoodall describes how adult animals when frightened move towards and hug one another. This behaviour she believes to be a direct extension of what is seen so regularly in the infant:
Thus a mature chimpanzee may embrace, reach out to touch, or mount another animal under similar circumstances and in more or less the same manner as a frightened or apprehensive infant runs to embrace or be embraced by its mother, reaches out to grasp or touch her hair, or stands upright behind her grasping her rump . . . ready to climb on if the situation warrants it.
The calming and reassuring effects of contact with another
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animal are discussed by van Lawick-Goodall in some detail. A touch, a pat, or an embrace from a dominant animal was quickly effective in calming a subordinate, and occasionally the reverse occurred. One mature male was seen to find comfort by embracing a female only three years old, once when he had a sudden fright from seeing his own reflection in a glass and twice after he had been attacked by another male.
Field observers of other primate species have also noted the strong propensity of a frightened or agitated animal to touch or cling to a companion. For example, in his description of the behaviour of wild Hamadryas baboons, which live in stable family units of one male with up to three females and their young, Kummer ( 1967) remarks that not only infants but adults also when under stress are strongly disposed to cling to a companion. Thus an adult female, when alarmed, clings to the back of her husband or is embraced by him. Conversely, when he is under stress during a fight, a male is likely to embrace one of his wives. When an animal that has left its mother but is still not fully mature becomes frightened it seeks out the highest- ranking individual within range. Since not infrequently it is the threats of this animal that aroused the fear in the younger animal the result is paradoxical: the young animal runs to and clings to the very individual that aroused its fear. Among many interesting features of Kummer's study is the evidence he presents that in this species the relationship of a mated male and female is patterned closely on the relationship of a mother and her infant.
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The persistence into adult life of patterns of behaviour seen first and at greatest intensity during infancy is found, then, to be a regular feature of the behavioural repertoire of other primate species. It warns us against supposing that, whenever something similar is observed in humans, as it so often is, it must be treated as an example of regression.
In wild animals it is never possible to be sure whether an individual would respond to a particular situation with fear were it to encounter it for the first time or whether it does so only after having learnt to do so. Fear of snakes is a case in point. Van Lawick-Goodall reports that the wild chimpanzees she observed showed fear both of a fast-moving snake and of a dying python. Yet it seems that chimpanzees brought up in zoos do not always show such fear. 1
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1 A great many zoologists, including Charles Darwin, have been interested in the marked
tendency for monkeys and apes to respond to -130-
Apparently incompatible findings of this kind are not difficult to reconcile. In a social species, to respond with fear to a situation, once learnt, is handed on by tradition. This point is well illustrated by an observation made in Nairobi Park ( Washburn & Hamburg 1965). A large band of some eighty olive baboons were sufficiently tame to be approached easily in a car. Two of these baboons were then shot (by a local parasitologist). Thenceforward the baboons fled on sight of man or car, and eight months later they still could not be approached although they had seen 'harmless' cars almost daily during the interval. This example is in keeping with the common finding that a response learnt as a result of a single violent experience does not extinguish quickly. It illustrates, further, that it is not necessary for more than a few animals in a band actually to have been exposed to the alarming experience, since it is customary for all the animals in a band to flee as soon as they either hear an alarm bark or see a dominant animal running off. Thus, by following a tradition once set by their elders, members of a band may for years treat whatever happens to have frightened one of their number, present or past, as potentially dangerous. By these means, a tradition that snakes, or men, or cars are to be avoided may develop and persist in one social group though not in another.
Until recent years there was a tendency to suppose that maintenance within a social group from generation to generation of special ways of behaving was a skill confined to man. Now it is recognized that cultural traditions occur also in many other species and affect many forms of behaviour: how to sing ( Thorpe 1956), what to eat ( Kawamura 1963), where to nest ( Wynne-Edwards 1962). It is no surprise, then, to find that in a bird or mammal species cultural traditions exist regarding what to avoid.
The part played in human development by culturally determined clues to potential danger is discussed further in Chapter 10. Here it may be noted that recent experimental studies of monkeys demonstrate clearly that an animal may
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snakes by strong fear, often amounting to panic, and many observations are on record. The evidence is reviewed by Morris & Morris ( 1965), who also record striking observations of their own. While some measure of learning cannot be ruled out, it is evident that in old- world monkeys and apes the tendency to fear snakes is very pronounced, is relatively specific and, if learnt, is remarkably long-lived in the absence of any further experience.
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learn to fear a situation solely by observing how a companion responds. For example, Bandura ( 1968) refers to a study by Crooks which shows that monkeys that initially played freely with certain play objects ceased to do so after they had witnessed another monkey (apparently) emit cries of fear whenever it touched one of the objects. 1
Experimental Studies
Many other studies of captive animals, including experimental studies, fill out our knowledge of the fear behaviour of nonhuman primates and of the situations that are likely to evoke it.
Two visual situations that arouse fear in young rhesus monkeys are a looming stimulus and the visual cliff. Both experimental situations are described in the previous chapter where the fear responses of human infants are discussed.
Schiff, Caviness & Gibson ( 1962) studied the behaviour of twenty-three rhesus monkeys of varying age when confronted by a looming stimulus; eight were infants of between five and eight months, and the remainder adolescent or adult. Each animal was tested alone in its own cage at a distance of five feet from the screen on to which the expanding (looming) shadow was projected. All but four of the animals responded immediately by either withdrawing or ducking. A number of animals sprang to the rear of the cage, often bumping hard against the back. Other and less active animals were quick to duck head and upper part of body. Younger animals often gave alarm calls as well. (The four animals that failed to respond were thought to be looking elsewhere when the stimulus was presented. ) No age differences were shown. The speed and form of the stimulus appeared irrelevant. No habituation occurred when two animals were each exposed to a series of fifteen looming trials at intervals of ten seconds.
When the same animals were confronted by a contracting (receding) shadow the response was quite different. All but four remained at the front of the cage and appeared interested as the shadow contracted. A general brightening of the screen also aroused interest. A darkening screen produced no particular response, except when it was presented after a looming stimulus: then it produced a few slight flinches, much milder than those that occurred to looming.
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1 In fact the distress vocalizations were played on a tape-recorder each time the monkey
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The number of young rhesus monkeys tested on the visual cliff is few, but responses are unambiguous. Walk & Gibson ( 1961) report on a male infant tested at ten days, and again at eighteen and forty-five days, and on a female infant tested at twelve and thirty-five days. During their second week both infants proved only fairly reliable in avoiding the 'chasm'. By the ages of eighteen and thirty-five days, respectively, the two showed pronounced discrimination and effectively avoided the 'deep' side at every test. Thus, in this species, avoidance of the deep side is only partly efficient when locomotion begins, but it improves rapidly. The results of similar experiments on another small sample of rhesus infants, reported by Fantz ( 1965), are of a similar kind.
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Strangeness has been used as a fear-arousing stimulus in many experiments with primates.
Harlow and his colleagues have conducted a number of experiments on the fear behaviour of young rhesus monkeys. 1 Before about twenty days of age an infant rhesus shows no sign of fear of strange visual stimuli; for example, it will confidently approach a moving toy animal it has never seen before. After that age, however, and especially after six weeks, the presence of such a toy leads an infant immediately to rush away from it. Infants that have been reared on a cloth dummy 'mother' not only flee from the alarming toy but return promptly to the familiar dummy mother, to which they then cling tightly. Often a rather older infant, of twelve weeks or more, having fled from the alarming toy and clung tightly to its familiar dummy mother, relaxes. Then it may leave the dummy mother and cautiously approach the fear-inducing toy; it may even explore it manually. The behaviour of the same infant when its familiar dummy mother is absent is, however, very different. It is likely then to curl up on the floor and scream (see below, p. 135 ).
Mason ( 1965) has carried out rather similar experiments with chimpanzees, also using strangeness as a main form of feararousing stimulus situation. In this species also behaviour is very different according to whether an animal is with others or alone. This leads to a consideration of the effects on nonhuman primates of compound situations, and especially of the striking effects of being alone.
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1 An account of some of Harlow's experiments is given in Volume I, Chapter 12. See also
Harlow & Zimmermann ( 1959); Harlow ( 1961); Harlow & Harlow ( 1965). -133-
Compound situations
Monkeys and apes are like humans in that, when confronted by a situation compounded of more than one alarming feature, they are apt to exhibit fear at an intensity far greater than they would were any one of the features to be present singly. Being alone in the presence of a fear- inducing stimulus, moreover, greatly intensifies the fear behaviour seen.
Being Alone
An experimental study reported by Rowell & Hinde ( 1963) gives quantitative data for a sample of seventeen rhesus monkeys, thirteen adult (three male and ten female) and four subadult (two of each sex). These animals live together in stable groups of a male with three or four females and young. The tests, each of which lasted for three minutes, consisted of very simple situations. In each test the tester, who was well known to the animals, stood close to the cage. In one he offered them pieces of banana; in another he stood quietly watching but not staring; and in a third he dressed up in mask and cloak and made slight movements. Before being tested each animal was observed for half an hour and its behaviour was recorded. Thereafter the three tests followed, separated by intervals of five minutes.
In the first series of tests the animals were tested while living together in their regular groups. Each time the tester appeared they showed a characteristic change in behaviour compared with what they had shown before the testing started. There was a great increase of threat noises and of activities, such as lipsmacking, scratching, and yawning, that are associated with
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stress. In addition, they urinated more frequently, their hair stood on end, and they showed a frightened facial expression. (Attacks were sometimes made by the adult males towards the tester but were not made by the other monkeys. )
Most of these forms of behaviour were considerably more in evidence when the observer wore the mask and cloak and moved than when he stood quietly by. Of responses seen in the mask test, significant increases in frequency were recorded for low aggression threat noises, hair standing on end, urinating, frightened expression, and yawning. In general terms it seems that, whereas the monkeys were merely 'made uneasy' when the observer quietly watched, when he wore the mask they became 'alarmed and angry'.
In a second series of tests each animal was tested alone. For
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a period of six hours before testing began the remainder of its group was locked into an indoor cage while the animal under test remained alone in its familiar outdoor cage; it could, however, hear its companions and see them through a window, so that it was far from being isolated. Nevertheless, for every animal, fear responses to the simple tests were far more frequent when it was alone than when it was with its group. Increased scores ranged from threefold to fiftyfold. The response showing the greatest increase in frequency was that of looking into the window where it could see its absent companions.
Summing up their findings, Rowell & Hinde write:
Thus isolation is best regarded not merely as an additional stress-producing factor acting equally under all circumstances, but rather as one which, while producing relatively little effect on undisturbed animals, can strongly accentuate the effect of other stress-producing agents. It is as though isolation multiplied their effects, rather than summating with them.
The results of Harlow's experiments on young rhesus monkeys brought up on dummy mothers strongly support this conclusion ( Harlow & Harlow 1965). In one series of experiments four infants raised on cloth dummy mothers were introduced, singly, to a strange 'room', six feet square, containing various objects known to be of interest to young monkeys. Each week two tests were given to each infant. In one the infant's dummy mother was present in the 'room', in the other it was absent. According to whether its dummy mother was present or absent the behaviour of an infant was utterly different.
When the dummy mother was present an infant, on entry to the strange room, rushed to it and clutched it tenaciously. The infant then relaxed and, showing little sign of apprehension, began climbing over the dummy mother and manipulating it. After several such sessions, the infants began to use the dummy mother as a base from which to explore. Leaving the dummy, an infant moved to a toy, picked it up and handled it, and then moved back to the dummy. Sometimes a monkey would bring its plaything with it. Exploration of an object away from the dummy mother alternated with rapid return to base. Throughout, the monkey seemed relaxed and confident.
In the absence of the familiar dummy mother, behaviour was radically changed. An infant either curled up on the floor rocking and crying, or else ran around clutching hold of itself.
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Exploration of the objects, when it occurred at all, was 'brief, erratic and frantic'.
