PSYCH 3F03 Lecture Notes - Lecture 16: Western Gorilla, Common Chimpanzee, Divergent Evolution
28 Oct 2016
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Psych 3f03 lecture 16 evolutionary origins. Evolution of increased preference for sexually desirable characteristics at estrus phase. Mating at all cycle phases: menstrual cycle studies on changes in preferences. Increased preference for masculine traits at peak fertility. Increased preference for these cues at peak fertility, prefer more at peak fertility. This behaviour is seen in other animals that have estrus. This behaviour is evolutionarily novel in humans and chimpanzees and these behaviours are a result of convergent evolution: we know this because bonobos don"t exhibit this behaviour. Evolution of increased preference for cues to paternal investment during phase of extended sexuality. Phase of extended sexuality in human beings is when we"re not fertile: menstrual cycle studies on changes in preferences. Increased preference for feminine traits when less fertile & at times when increased sources are required (e. g. pregnancy/pill) This behaviour is evolutionarily novel in humans and evolved after we split from chimpanzees: humans are the only apes with biparental care.
