PSY395H5 Lecture Notes - Lecture 9: Crepuscular, Ocelot, Djungarian Hamster
27 Nov 2015
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Document Summary
All organisms have adapted to 24 hour cycle and some species restrict their activity to one cycle; nocturnal or daylight. Circadian: describes most rhythmic processes in body in animals. Infradian: less than year, more frequent than circadian though. Any bio"l process that reoccurs that is characterised by period, amplitude, Amp: the change above or below the avg value. freq"c, and phase. Period: most important; it is the length of time to complete one cycle in rhythm of questions. Phase: second most important is phase, represents a point in rhythm relative to a subject in the cycle. Nocturnal: active at night, inactive at day. Wake up at dusk, active when dim light and at dawn. Niche occupied by prey animals in order to avoid predators during the day and able to forage during dusk when others are asleep. Bio"l rhythms: endogenous, not dictated by external cues. Zeitgebers are cues that entrain endogenous rhythms. means can be totally environmentally driven.
