Study of 64 infants showed that (1) once infants began to cry, they tended to persist, (2) only older infants specifically missed their mothers, and (3) tendency to cry was not related to maternal responsiveness or sex of child. (MH)

Evaluates the epigenetic landscape metaphor in light of behavioral development. Cites two common errors in integrated models of behavior and biology: (1) fixing behavior as structure, thereby robbing it of dynamics and plasticity; and (2) assuming that a single optimal trajectory applies to development of organisms or systems. (BC)

Experimental and ethological studies were undertaken to clarify the role of positive and negative evaluations in the control of the child's performance on laboratory and classroom learning tasks. The results indicate that "social reinforcers" are effective to the extent that they communicate to the child unambiguous information on the adequacy of…

Changes from the expected life course can arise from at least three different reasons in longitudinal work: developmental novelty, errors in diagnosis, and errors in expectation. This longitudinal study examined the social development of 220 fourth graders and 475 seventh graders over a period of 10 years with over 98 percent of the original…