No More Learning

1977: 4-5); by 1990 clinicians had concluded that it "may occur in two percent to five percent of the general population" (Bradley & Zucker 1990: 478), a finding revised by these same authors nine years later, who liken its           to a disorder such as autism, itself a diagnosis with an estimated incidence rate that has steadily increased over the past decades (Zucker & Bradley 1999: 24).