Postnatal apoptosis sex differences in human brain

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postnatal apoptosis).
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Sex differences in human brain These differences are corrected for differences in overall brain size (male brain is bigger than women; proportional to body size).
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What are behavioral effects of these differences in the brain? Sexual behaviors To be discussed in the next 3 lectures Cognitive abilities e.g. ADHD is more prevalent in M Language Women tend to show greater language skills Empathy Women tend to be empathizers Men tend to be systemizers Relation to autism Play behavior & preferences M prefer things that move and can be manipulated F prefer dolls & imaginative play Spatial abilities
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Figure 4.1 Sex differences in monkey play
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Spatial abilities in humans Men’s greater performance on spatial tasks mental rotations space relations Differences in wayfinding Men: Dead reckoning, vectoring Women: Routes, landmarks
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A new way to think about sex differences & spatial abilities Adaptive problem: food acquisition Sexual division of labor Foraging Adaptation Hypothesis (Silverman & Eals) Hunting Gathering New et al, 2007
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Predictions Women should perform better on spatial tasks that tap abilities important for gathering Object Memory Object Location Experiments Paper-and-pencil object array Naturalistic setting Directed and incidental learning conditions
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Hypothalamus & Sexual Orientation Neural correlate of sexual orientation
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Further Studies of the Neural Correlates of Sexual Orientation LeVay- INAH-3 of hypothalamus smaller in homosexuals. Gorski – Anterior commissure larger in homosexuals. Swaab – Suprachiasmatic nucleus (SCN) is larger in homosexuals. All data is disputed and sample sizes are small
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Physiological Responses to E LH surge induced by an injection of estrogen Heterosexual M show little to no LH surge to an injection of Estrogen Heterosexual F show a “normal” LH surge to an injection of Estrogen Homosexual M show an intermediate LH surge in response to Estrogen LH surge is the result of temporary
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