Autism Spectrum Disorder (ASD), a developmental disorder that often interferes with a person's ability to communicate with and relate to others, affects about 1 in 68 school-age children. Dr. Bennett Leventhal, a psychiatry professor at UCSF, discusses the history and diagnosis of Pervasive Developmental Disorders (PDD) such as autism and Asperger's. He also looks at the prevalence, assessment and risk factors. Recorded on 05/25/2016. (#31002)