Discusses several philosophies of linguistics and semiotics that debate the importance of words and their relationship to signs, language as the primary modeling system, and the historical primacy of verbal versus visual communication. Describes human communication as both language-based and nonverbal, both aspects inviting arbitrary and abstract…

The research discussed here, primarily that of P.J. Gal'perin and his associates at the University of Moscow, is an experimental demonstration of basic tenets of Vygotsky's theory. According to Gal'perin, grammatical knowledge is formed first by teaching the students material grammatical actions; these actions are ultimately to become mental…