The recent increase in the availability of infant-directed video material (e.g., "Baby Einstein") and the corresponding increase in the amount of time that infants and toddlers spend viewing them have prompted concern among parents and professionals that these media might impede aspects of cognitive and social development. In contrast, supporters…

Responds to calls for combining the ideas of Piaget and Vygotsky, discussing differences between the two perspectives. Notes that differences are found in underlying assumptions about the nature and process of development, philosophy, stages of development, developmental influences, and the integrity of cognitive structures. Suggests that, given…

Addresses the extent to which differences in Piagetian and Vygotskyan psychologies make their theories incompatible. Differences result from a Vygotskyan belief in a material primary cause for development; Piagetians do not hold this view. Explores this difference in perspective, concluding that, despite it, the two approaches are compatible. (JW)

The basic properties of a dynamic systems approach of development are illustrated by contrasting two simple equations. One equation is characteristic of dynamic systems models. The other refers to what, for the sake of simplicity, is referred to as the standard developmental approach. We give illustrations from cognitive, language and social…