Proposes a cognitive theory of imitation based on Piaget's interpretations in which imitation is considered one form of overall cognitive functioning instead of a special mechanism for response acquisition. Other theories of imitation, and relevant empirical literature are reviewed and reinterpreted from the cognitive perspective. (DP)

The philosophies underlying the learning and structural theories used in psychology are described in this article. It is argued that a dialectical view provides some ways to breach the chasm between learning theory and the study of human development. (Author/DB)

Proposes an operant framework for the analysis of environment-intelligence interactions in old age and calls for an implementation of research aimed at examining the range of modifiability of intellectual proficiency in the elderly. Intellectual decrement is interpreted to reflect the lack of supportive environmental contingencies. (Author/SDH)

Criticizes the operant approach to the study of life span development from a theoretical behaviorism view. It is argued that the operant approach is too limited in its scope to enhance significantly the conceptualization and understanding of life span development. (Author/DB)