Aschoff (65):
Student Study, underground bunker for a few weeks with no external stimuli therefore, choose sleep-wake in absense of exogenous zietgebers.
Sleep disrupted --> settled to 24.9 s-w cycle (sleep-wake)
Conclusion; There is a endogenous pacemaker and exogenous zietgebers have an effect on internal rhythms.
CASE STUDIES: Siffre (75), Falkard (96) and Miles et al (77):
S: 6 months in actual cave. c. rythm --> 25-32 hrs S-W cycle. Conclusion: There is a endogenous pacemaker.
F:30hr C.(circadian) rhythm BUT individual differences and genetic influences
M: completely blind since birth --> 24.9 hrs BUT no exogenous zietgebers
-->body clock doesn't reset?
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