This study compared the regulation of cognitive activity in 30 children (ages 15 to 95 months) with autism or mental retardation matched for global, verbal, and nonverbal developmental ages. Testing on tasks of object permanence indicated that the autistic children had a pervasive difficulty in maintenance set, made more perseverative errors, and…

Studied semantic and cognitive development of Korean-speaking and English-speaking children. Found that categorization and a naming spurt emerged later in Korean speakers than in English speakers, while means-ends abilities and success/failure words emerged earlier in Korean speakers than in English speakers. Also, Korean-speaking mothers…