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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