Key Study: Siffre (1975)
Aim: Siffre aimed to investigate the free running time of his sleep/wake cycle.
Method: He spent 6 months in a cave with no external cues i.e. light, clocks, tv or radio. He was wired up in order to monitor bodily functions.
Findings: At first his sleep wake cycle was erratic ranging from 13 to 48 hours. However after a while this pattern settled at 24.9 hours.
Conclusions: The circadian sleep wake cyle exists however external cues are needed in order to maintain/correct it.
Evaluation Points Conducted in a cave and so therefore lacks ecological validity.
The study fails to take into account any individual differences in circadian cyles.
Research methadology may have lacked internal validity as cave lights may have been seen to act as exogenous zeitgebers.
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