Observed a group of 46 children classified at 20 months as either behaviorally inhibited or uninhibited, and 18 children who were classified aa falling at neither extreme at 5.5 years of age, in contexts designed to evaluate behavior in social situations and heart rate, heart variability, and pupillary dilation to cognitive tasks. (HOD)

This study focuses upon some aspects of the social behavior of 2-year-old children being reared in long-stay residential nurseries. These children are compared with working class 2-year-old children being raised in two-parent homes in which the mother is not working full-time and there are no older siblings of preschool age. All children were…