Preschool children were asked to participate in an activity of high initial interest, either for its own sake or in order to obtain an extrinsic reward. Children who participated as a means to some ulterior end showed less intrinsic interest in the activity. (SDH)

Study found that stimulus presence during a delay of reinforcement interval enhanced performance, and to a large extent prevented the usual delay-produced decrement. (Authors)

Examines peer influences on the sex-role development of preschoolers. The occurrence of sex-stereotyped activities and peer responses to them were observed in a naturalistic setting. (CM)