Psych 03-25

Psych 03-25 - 03/25/08 Notes Motivation Chapter 10...

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03/25/08 Notes Motivation Chapter 10 continued. Sexual Orientation- degree of sexual attraction to persons of opposite or of same sex. Nature vs. Nurture (More evidence on nature side) Sexual orientation usually determined by adolescence, typically 3 years before sexual contact with the same sex. Homosexual “feelings” not “behaviors” are antecedents of adult orientation. Role of genetics: Men: identical twins 52% also gay Fraternal twins: 22% also gay Women: identical twins 48% lesbian Fraternal twins: 16% lesbian Sex hormones levels in adulthood: No differences in male homosexuals Higher levels of T in 30% of female homosexuals Role of prenatal hormones: Organizational effect*- the brain must be organized so that behavior can be activated after puberty. Congenital adrenal hyperplasia (CAH)- higher exposure to testosterone Adrenals secrete abnormal levels of androgens 37% bisexual or homosexual 40% heterosexual
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Psych 03-25 - 03/25/08 Notes Motivation Chapter 10...

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