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Definition

Pervasive Developmental Disorder (PDD)

Pervasive Developmental Disorder (PDD) is a class of neurological disorders usually evident by age 3. They are characterized by severe and pervasive impairment in social interaction skills, communication skills and possibly by stereotyped behavior, interests and activities. Pervasive Developmental Disorders include autism, Asperger’s syndrome and nonverbal learning disorder.

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