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Studies of mental development, both in ontogeny and in its historical aspect, have been appearing in steadily increasing numbers [12,27]. In none of these studies, however, has any attempt been made to distinguish between the variable and the universal in mental development. Perhaps the question of distinguishing invariant (constant, relatively permanent) from variable forms of behavior is relevant in a broader context, in contrast to the applicability of that distinction to the development of mental activity over history. Nevertheless, it is with the latter that we shall be primarily concerned.
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