“Although practical intelligence [tool use] and sign use [language] can operate independently of each other in young children, the dialectical unity of these systems in the human adult is the very essence of complex human behavior [cognition]. Our analysis accords symbolic activity a specific organizing function that penetrates the process of tool use and produces fundamentally new forms of behavior.” (p.24)

“Although practical intelligence [tool use] and sign use [language] can operate independently of each other in young children, the dialectical unity of these systems in the human adult is the very essence of complex human behavior [cognition]. Our analysis accords symbolic activity a specific organizing function that penetrates the process of tool use and produces fundamentally new forms of behavior.” (p.24)

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