Infants at two, four, and six months of age learned a string-pulling task and were tested again two months later. Individual differences in emotional expressions of anger during extinction, and interest and enjoyment during learning, were stable over the two-month interval. (BC)

This study used structural equation modeling and multilevel modeling approaches for purposes of simultaneous study of individual and group change patterns on three waves of two longitudinally assessed domains. This study illustrates a few of the dual approaches to the analysis of covariance structures as they relate to the same individual growth…

This study investigated whether individual change over time in mathematics and language differs from student to student and whether individual parameters of each of these domains were related within domain. The study also attempted to gain an understanding of individual change in student academic achievement through the application of one of the…