Autism or PPD (pervasive developmental disorder) is defined by the Columbia encyclopedia as a rare neurodevelopmental disorder characterized by the inability to relate to and perceive the environment in a realistic manner. The onset of the disorder is in infancy or early childhood, generally before the age of thirty months, and males are affected four times as often as females. Symptoms include impairment in social interaction, fixation on inanimate objects, inability to communicate normally, and …
showed first 75 words of 1712 total

showed last 75 words of 1712 total
…Article with a Print Counterpart| (1993). Autism. In The Columbia Encyclopedia, 5, p.2668. Columbia University Press. Article with a Print Counterpart (1981, March). Autism- Part I. Harvard Mental Health Letter. 13 1, 4 Article with a Print Counterpart (1999.) Practice Parameters for the Assessment and Treatment of Children, Adolescents, and Adults With Autism and Other Pervasive Developmental Disorders. Journal of the American Avademy of Child and Adolescent Psychiatry, 38, 32s. Article with a Print Counterpart (1999, Dec.). Possible Gene on Chromosome 13. Applied Genetics, 20, NA