The role of endogenous pacemakers and exogenous zeitgebers 3.5 / 5 based on 2 ratings ? PsychologyA2/A-levelAQA Created by: RyanCreated on: 03-12-12 21:31 In what order does information pass? Exogenous zeitgeber (EZ) -> Suprachiasmatic Nucelus (SCN) -> Endogenous pacemaker 1 of 14 What are exogenous zeitgebers (EZs)? External givers of time 2 of 14 What is the main source of EZ in humans? Light 3 of 14 What does the EZ do? Keeps the internal clock in sync with the rest of the world if it needs resetting 4 of 14 Examples of EZs? (Routines) TV, sound, smell, light 5 of 14 What is the suprachiasmatic nucelus (SCN)? A cluster of neurons in the hypothalamus. It is thought to be the site of the endogenous pacemaker 6 of 14 What does the SCN contain information from? The exogenous zeitgeber 7 of 14 What is an endogenous pacemaker (EP)? The internal biological clock 8 of 14 What does it allow animals to do? Control their internal rhythms and allows them to anticipate external events 9 of 14 The tick is.. any length of time 10 of 14 What is melatonin? Drowsy hormone 11 of 14 What did early research assume? The sleep/wake cycle was controlled by day-night-day sequence 12 of 14 What did this suggestion therefore assume? Our cycles would be controlled by external factors, mostly the changing level of light (EZ) 13 of 14 Who was this first suggested by? Hufeland in 1794 14 of 14
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