PRIVATE SPEECH: FOUR STUDIES AND A REVIEW OF THEORIES.

Similarities and differences in the views of private or egocentric speech held by Piaget, Vygotsky, G. H. Mead, and Flavell are examined. These views are related to previous findings and to four new studies of the effects of age,IQ, and task difficulty upon private speech in various natural and experimental settings. These studies support the "cognitive development" interpretation common to all the theorists in that mental age and task difficulty were found to be primary and regular determinants of private speech in contrast to such factors as sex, nationality, or chronological as opposed to mental age. The findings also support Vygotsky's belief that private speech has a curvilinear course of development (due to its functioning as a transition from outer speech to thought) as opposed to Piaget's view that it declines monotonically with cognitive and social maturity. 7 types of private speech are defined and evidence is presented suggesting that they form a developmental hierarchy consistent with Mead's view of the transformations of external communication to inner thought. [ABSTRACT FROM AUTHOR]