Reviews Greenough, Black, and Wallace's (1987) conceptual framework for understanding the effects of early experience and sensitive periods on development, and illustrates the applicability of their model with recent data on the consequences for animals and human infants of the acquistion of self-produced locomotion. (BN)

Discusses the use of a dynamic approach to explain how young children master motor skills and perform an array of cognitive feats including word learning. Introduces a perspective that is a departure from established scientific theories of the mind. Argues that a child's physical, mental, and social lives arise out of a shifting interplay between…