Consideration of underlying neurological and psychological deficits suggests that the autistic syndrome results from the coexistence of at least two distinct constellations of functional impairments: deficits in mechanical language skills, as in the developmental dysphasias; and deficits in social relatedness, play, and nonverbal communication, as…

This study examined the effectiveness of the Behavior Summarized Evaluation to discriminate 58 autistic from 58 nonautistic mentally retarded children. The measure clearly separated the two samples with between-group differences highest on four items indicating the most particular pattern in autistic children was the association of autistic…

This study found that siblings (n=19) of severely autistic children, siblings of children with Down's syndrome, and siblings of normal children did not differ on measures of perceived self-competence or parents' report of social competence. Siblings of autistic children had more internalizing and externalizing behavior problems than siblings of…