| “The use of artificial means [tool and symbolic artifact], the transition to mediated activity, fundamentally changes all psychological operations just as the use of tools limitlessly broadens the range of activities within which the new psychological functions may operate. In this context, we can use the term higher psychological function, or higher [truly human] behavior as referring to the combination of tool and sign in psychological activity.” (Vygotsky, 1930/1978, p.55) |
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