PS261 Lecture Notes - Lecture 7: Ultradian Rhythm, 8 Seconds, Stimulus Control
Document Summary
Entrainment: the clock can be set" by zeitgebers (time-givers), if the time-giving stimulus is periodic (ex. Sunrise and sunset), the clock becomes entrained to the stimulus. Limit is around 19 hours and max are 26 hours: in the absence of zeitgebers, the free-running clock is imprecise, no external way for it to latch onto. Internal is not accurate at all, cannot keep a 24-hour cycle. In humans, usually is longer than 24 hours. In graph they are waking up a little later everyday. Internal clock times slightly longer than 24 hours. Time-place learning: learning that an event occurs at a particular time in a particular place, a certain location is important at a certain time, ex. Birds, put a bird in a circle room, fed in the three other rooms in the rooms attached. Only get fed in the one of three rooms, normally locked rooms. Only open one room at every different time of day.
