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Biological Rhythms (Sleep cycle (Low light level detected by retina, Optic…
Biological Rhythms
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Sleep Cycle
Stages 3 and 4 - Slow wave sleep, person is not easily woken, Delta waves
Stage -REM (rapid eye movement), body is paralysed but brain activity speeds up to that of an awake person because we are dreaming
Stages 1 and 2 - Sleep escalator, person is easily woken, Alpha and then Theta waves
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A man spent 6 months underground with no external cues and he thought he had only been gone 5 months which shows evidence for exogenous zeitgebers
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Hamsters with a 20hr cycle had their SCN cells removed and when they were put in normal hamsters and then their cycled changed. Shows SCN is responsible for endogenous pacemakers
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