Investigates the developmental differences in spatial exploration and memory, depending on the purposes for which children six- to seven- and eight- to nine-years-old explored the space. The results suggest that children's knowledge of large-scale space is tailored to the purpose of acquiring such information. (Author/BB)

Examines the development of intuitive theories of motion among college students and children between the ages of 4 and 12. School-aged children made more erroneous predictions on the path a ball takes upon exiting a curved tube than preschoolers, kindergarteners, and college students. Results related to the "growth error." (Author/BB)

Attempts to identify deficits in object knowledge specific to the autistic syndrome. Examines the correspondence between sensorimotor and play behaviors and language in mentally retarded and normal children. Determines whether these correspondences are different for autistic, mentally retarded, and normal children.(Author/AS)