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Unformatted text preview: Exam 3: 19. Sociobiology of Human Behavior Menstrual cycle variation in womens preferences for the scent of symmetrical men o Female sexual preferences change across menstrual cycle o EPC in most fertile period o IPC evenly spread out o Consistent with women seeking men with phenotypic markers of genetic benefits just before and during ovulation o Tested if womens olfactory preferences for mens scent tended to favor scent of more symmetrical men during their fertile period o College women rated attractiveness of scent of 41 T-shirts worn for two nights by different men o Non-pill using/normally cycling women near peak fertility tended to prefer scent of symmetrical men o Pill using and normal cycling women at low fertility of cycle had no preference o Separate analysis reviled within the set of normally cycling women, individual womens preference for symmetry correlated with their probability of conception given the actuarial value associated with the day of the cycle they reported at the time they smelled the shirts\ o Peak sexual desire is in midfollicular or ovulatory phase o Last days of follicular phase is maximal fertility and when most EPCs happen (2.5X their rate when fertility is low) o Olfactory perception is an appropriate sensory modality to explore changes in preference because 1. men rate visual information about and odor of a mate as equally important Women single out olfaction as the sensory modality that most affects sexual responsivity and mate choice 2. Womens olfaction changes across menstrual cycle 3-androstenol is a sexually dimorphic substance that gives the body a musky smell and womens olfactory sensitivity to it is enhanced before ovulation and in the mid-luteal phase Normally ovulating women interpret androstenone (in human sweat) more favorably near ovulation o Fluctuating asymmetry is absolute deviation from perfect symmetry on characters that are on average symmetrical on the two sides of the body o Low FA, higher mating success o Because FA is heritable, good genes sexual selection may contribute to the greater mating success enjoyed by more symmetrical individuals o Low FA predicts mens number of sexual partners, facial attractiveness, number of EPC partners, and number of times chose an as EPC partner, frequency of partners orgasms o Women prefer scent of men whose major histocompatability genes differ from their own o Used different ethnicities for men and women in the study and neither mens FA or odor attractiveness ratings varied across ethnicities so ethnicity was ignored in the analysis o Measured each TWICE with a digital caliper sensitive to 0.01 mm ear length and width, elbow width, wrist width, ankle width, foot breadth and length of all fingers except the thumb o They also did a questionnaire o Men had to wash sheets with unscented detergent, wore tshirt for a particular two nights, not sue scented soap or deodorant or cologne (we gave them soap), not eat garlic, onion, green chilli, pepperoni, spices,...
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