PSY395H5 Lecture Notes - Lecture 9: Zygosity, Estrous Cycle, Pineal Gland
Document Summary
All organisms have adapted to 24 hour cycle and some species restrict their acivity 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, freq"c, and phase. Period: most important; it is the length of ime to complete one cycle in rhythm of quesions. Amp: the change above or below the avg value. Phase: second most important is phase, represents a point in rhythm relaive to a subject in the cycle. Wake up at dusk, acive 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. A certain plant closes at night and opens in day (she didn"t name the plant).
