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The prevalence of autism spectrum disorder (ASD) has increased since the 1960s and is currently estimated at 60 to 116 cases per 10,000 children. In part, the increase reflects an expanded definition that includes the full spectrum (autism, pervasive developmental disorder not otherwise specified, and Asperger syndrome), new administrative classification systems in special education programs, and greater awareness among professional and parents. (A recent Centers for Disease Control retrospective surveillance study, released after the publication of this seminar, suggests that the rate of ASD in the U.S. is 1%).
Core symptoms of ASD affect socialization, communication, and behavior, including…