Studied the development of speech act comprehension in 36 retarded and 36 nonretarded children at the developmental ages of five, seven, and nine years. Retarded and nonretarded individuals followed the answer obviousness rule and used the contextual and linguistic clues available to respond to yes-no interrogative sentences. (RJC)

Describes three experiments that tested autistic children's nonverbal and verbal categorization abilities. Concludes that autistic children do not suffer a specific cognitive deficit in ability to categorize and form abstract concepts. (HOD)

This study examined the relationship between adaptive functioning and intellectual functioning in 18 children with autism and mental retardation and 20 children with mental retardation. The children with autism showed significantly more impairment in adaptive behavior composite scores, verbal reasoning abilities, socialization skills, and…

Describes two studies investigating the development of recursive thinking in 60 Dutch children five, seven, and nine years of age. The first study replicated earlier research employing a verbal production procedure. The second study used verbal comprehension procedures and concluded that development appears two years earlier than indicated by the…