Exogenous Zeitgebers

1. External cues which regulate our internal body clock, in order to remain in the time with our circadian rhythms (9, 10)
4. The process of resetting the biological clock using exogenous zeitgebers (13)
5. An example of Social Cues as Exogenous Zeitgebers (6)
9. Found that if you shine light on the back of participants' knees, you canvary their sleep cycle by up to 3 hours (7, 3, 6)
10. Found that one participants' sleep/wake cycle extended to 29 hours, even tho they were deprived of 'natural' light. (7, 3, 5)

2. We are influenced by the norms of people around us as to what time we wake up and sleep. (6, 4)
3. This is the key zeitgaber in humans. It can reset the bodies main endogenous pacemaker, and plays a role in the maintenance of the sleep/wake cycle. (5)
6. When babies are first born they dont have a circadian rhythm. At how many weeks does the circadian rhythm start by? (3)
7. one example of an Exogenous Zeitgeber (11)
8. By 16 weeks, babies tend to e in a routine; which exogenous zeitgeber does this demonstrate? (6, 4)

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