Piotr Galperin: Equal among Equals

This paper is dedicated to the 110th Anniversary of Piotr Galperin. The author stresses that the theory created by Galperin has equal rights among other widely recognized concepts in developmental psychology that consider an individual act the origin of human mental development. The author also reviews the classical psychologists' notions about the structure, function and dynamics of object oriented act in child development. The paper draws upon the classification of creative innovations in research proposed by the French sociologist L. Thevenot

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