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Moving beyond the traditional "nature-nurture" debate about the origin of sex differences, the structural-developmental model described in this paper links many of the sex differences reported in the literature to early cognitive structures that shape and distort concepts in inevitable ways. The heightened levels of aggression and power-seeking reported among boys are seen as the child's effort to give psychological expression to his perceived gender attributes.
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Dorothy Z. Ullian (1981) studied this question.
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