This study tests the hypothesis that components of play such as immagination contribute to cognitive development. Twenty-four middle-class children attending a university-affiliated preschool were observed for 20 one-minute play observations during the Spring Semesters of 1978 and 1979. Play was coded using categories for both social (solitary,…

Fifty-four 5-year-old Head Start children participated in a study of the effect of varied versus repeated training on the development of the ability to categorize and transfer learning. The children were grouped according to chronological age and results of a mastery test and the Peabody Picture Vocabulary Test. Work categories translated into…

The four purposes of this study were (1) to test the long-range effects of classification training (CT) on disadvantaged black children, (2) to evaluate the effects of reintroducing CT to those previously trained, (3) to compare CT at two age periods (5 and 6 years old), and (4) to compare CT with attention training (AT). Of the 69 children used…