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Evolutionary Psychology

Evolutionary Psychology. Asymmetrical Pressure. “I have been noticing you around campus. I find you very attractive. Would you go out with me tonight?” Women: 50% Men: 50%. Asymmetrical Pressure.

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Evolutionary Psychology

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  1. Evolutionary Psychology

  2. Asymmetrical Pressure “I have been noticing you around campus. I find you very attractive. Would you go out with me tonight?” • Women: 50% • Men: 50%

  3. Asymmetrical Pressure “I have been noticing you around campus. I find you very attractive. Would you come to my apartment tonight?” • Women: 6% • Men: 69%

  4. Asymmetrical Pressure “I have been noticing you around campus. I find you very attractive. Would you go to bed with me tonight?” • Women: 0% • Men: 75%

  5. Asymmetrical Pressure MenWomen Date 50% 50% Apartment 69% 6% Bed 75% 0% (Clarke & Hatfield, 1989)

  6. Sexual Signaling • Costly - require good health • Honest - reflect good health

  7. Sexual Signaling

  8. Sexual Signaling • Concealed ovulation: • competing pressures • signaling fertility • hiding lack of fertility

  9. Attractiveness

  10. Attractiveness

  11. Attractiveness

  12. Attractiveness

  13. Attractiveness

  14. Attractiveness

  15. Attractiveness

  16. Attractiveness • Indicators of health/fertility: • HWR • symmetry & averageness of features • both adults and infants demonstrate this preference • Chinese and Japanese showed same preference • (women show a preference for odor of symmetrical bodies only when they are ovulating) • youthful - baby face • fluctuating asymmetry (2D:4D) • cultural differences

  17. Paternal Uncertainty • Gene shopping • Resemblance - does the baby resemble the mother or the father? • mothers • rate infant as resembling the father • mothers, if father present • rate infant as resembling the father • mothers family • rate infant as resembling the father • fathers • equally likely to rate infant as resembling father or mother (McLain et al., 2000; Knieps, 1997)

  18. Paternal Uncertainty • Response bias or greater paternal resemblance?

  19. Paternal Uncertainty • Response bias or greater paternal resemblance? • impartial judges • varies by study: • rate infant as resembling the mother • equally likely to rate infant as resembling father or mother (McLain et al., 2000; Knieps, 1997) • “It’s a wise man who knows his own son.”

  20. Paternal Uncertainty • How common is gene shopping? • Paternal testing laboratories • ranging from 1 in 7 to 1 in 10 children not sired by person identified as father • Accurate?

  21. Female Orgasm • Sexual pleasure • Domestic bliss • Male ego • Paternal confidence

  22. A few Comments onEvolutionary Theory • Adaptation vs. random genetic drift • Punctuated equilibria vs. gradual evolution/adaptation • species do not evolve slowly • fossil record - leaps, not gradual change • fossil record - gradual changes suggests random genetic drift • Evolution of new species vs... adaptation within species

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