Circadian Rhythms

  • Created by: Tim
  • Created on: 09-12-12 16:38
What is a circadian rhythm?
24 hour cycles of activity
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What is an endogenous pacemaker?
Biological clocks that control bodily rhythms
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What is an exogenous zeitgeber?
An environmental factor that affects endogeous pacemakers e.g. light
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Describe Siffre's research
He spent 6 months in an underground cave in Texas. He telephoned to communicate whether he wanted the light on or off. His days shortened as he came out on the 151st day (thought it was 176th day)
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What are the positives of this research?
+ Supports the influence exogenous zeitgebers (light) has on endogenous pacemakers + Supported by Stephan & Zucker
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What are the criticisms of this research?
- Conditions of cave living may have modified rhythms - Case Study - hard to generalise from - Lacks mundane realism - people dont normally spend 6 months in cave
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Other cards in this set

Card 2

Front

What is an endogenous pacemaker?

Back

Biological clocks that control bodily rhythms

Card 3

Front

What is an exogenous zeitgeber?

Back

Preview of the front of card 3

Card 4

Front

Describe Siffre's research

Back

Preview of the front of card 4

Card 5

Front

What are the positives of this research?

Back

Preview of the front of card 5
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