ANTH 101 Lecture Notes - Lecture 15: Nocturnality, Cognitive Map, Encephalization

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Communication: vision (most important) - rely most heavily on, hearing, smell (olfaction) Vision : rely on most heavily, coloration (in fur, facial expressions, gestures/displays. Visual trichromacy: strepsirrhini"s - color blind, platyrrhini (except howler monkeys) and catarrhines have trichromatic vision. Trichromatic vision - the ability to distinguish red hues from green. Purpose: to evaluate the color of ripe fruit and identify secondary sexual. Facial expressions characteristics in potential mates: bared teeth, pant hoot, play face, bulging lip face, scream. Gestures: threat - threat yawn, dominance - mounting to establish dominance, submission. Hearing: vocalization, alarm calls, long calls. Displays: gestures that go along with a vocalization. Affiliative behaviors: patting, hugging, holding hands = reassurance, grooming (reinforces sexual hierarchy, reinforce social bonds. Smell (olfaction: some primates rely heavily on sense of smell. Olfactory bulb is pretty small in primates: olfaction: Accessory olfactory system - processes chemical information. Chemical signals: health, dominance, territory, mating.

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