Compared performance of preschool children, chimpanzees, and orangutans on nonverbal task of false-belief understanding and tested children's performance on a verbal version of the same task. Found that children's performance on verbal and nonverbal tasks were highly correlated, and no chimp or orangutan succeeded in the nonverbal false-belief…

Five experiments compared metamemory abilities in 6- to 9-year olds with autism, mentally retarded children, and normal controls. Found that children with autism were not impaired on any of the metamemory tasks, although they were less likely than controls to make spontaneous use of memory strategies involving other people. Unexpectedly few…

Investigates the metalinguistic ability of monolingual or bilingual children between five and nine years of age on two language tasks (grammaticality judgment and correction). (HOD)