Piaget's concept of "internalization" is analyzed and related to Bruner's representational theories of cognitive development. Cognitive structures are shown to be real exclusively in an actual representation. (Author/SDH)

This study examined (1) the level of symbolic capability as revealed in play, (2) the use of spontaneous vocal imitation, and (3) the nature of certain classes of words occurring in spontaneous infant language. Facets of child behavior were examined during the period of single-word utterances and early multiword combinations with a view to…

Explores two hypotheses about the effect of symbolic systems on psychological functions: (1) culturally elaborated systems of signs affect psychological functioning in a general way; and (2) systems of signs, when used to support skilled action, affect the organization of human activity. Reviews research that supports the second hypothesis. (LB)