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Hormones & Sexual Behavior. Lecture 26. Sexual Behavior: Rats. Controlled by sex hormones Female Proceptive ear wiggling, darting, hopping Receptive - lordosis Male mounts copulates ~. Organizational Effects of Hormones. SDN & SNB Critical periods Humans - prenatal

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Sexual behavior rats
Sexual Behavior: Rats

  • Controlled by sex hormones

  • Female

    • Proceptive

      • ear wiggling, darting, hopping

    • Receptive - lordosis

  • Male

    • mounts

    • copulates ~


Organizational effects of hormones
Organizational Effects of Hormones

  • SDN & SNB

  • Critical periods

    • Humans - prenatal

    • Rats - Perinatal

      • easily manipulated ~


Hormones sexual behavior1
Hormones: Sexual Behavior

  • Gonadectomy

    • at birth

  • Adult males

    • testosterone  no male behavior

    • estrogen  lordosis

  • Adult females

    • estrogens  no female behavior

    • testosterone  male behavior ~


Human sexual behavior
Human Sexual Behavior

  • No stereotypical M & F behaviors

  • Men are like rats

    • Testosterone: activational role

  • Women

    • Estrogens no activational effects

    • Testosterone levels correlated with frequency of intercourse ~


Homosexuality
Homosexuality

  • Sex hormones role?

    • rats - yes

    • Humans?

      • no difference in circulating hormones

  • Learning experiences?

  • or biologically determined?


Homosexuality1
Homosexuality

  • Simon LeVay

    • Brains of male AIDS victims

    • Anterior Hypothalamus

    • Anterior Commissure

    • Suprachiasmatic nucleus

  • SDN (rats)

    • Humans: 3rd interstitial nucleus of the Anterior Hypothalamus

    • INAH-3 ~


3d interstitial nucleus

  • Anterior commissure larger in females

    • Similar relationship ~

.15

.10

.05

Volume

mm3

F H-M M


Homosexuality 2 hypotheses
Homosexuality: 2 Hypotheses

  • 1. Prenatal androgen levels

    • low in XY fetuses that gay

    • high in XX fetuses  lesbian ~


Homosexuality 2 hypotheses1
Homosexuality 2 Hypotheses

2. Inherited Genes

  • MZ twin concordance approx. 50%

    • DZ twins approx. 20%

  • Xq28- tip of the X chromosome

    • 33 of 40 pairs of gay brothers

    • fetal brain response to androgens ~


Nature vs nurture
Nature vs. Nurture

  • John/Joan

    • penis destroyed during circumcision

  • 1960s - Gender deemed neutral at birth

    • constructed female genitalia

    • hormone treatment

    • 12 yrs old: positive results reported ~


Nature vs nurture1
Nature vs. Nurture

  • By 14 yrs old: living as male

    • reconstructive surgery

    • male hormone treatment

    • married by 25

  • Reassessment in 1996

    • rejected female role much earlier

  • Pendulum swings back toward nature

    • sex/gender not so malleable ~


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