Cirdian Rhythms

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  • Circadian Rhythms
    • are patterns of behaviour that occur or recur approximately every 24 hours, e.g sleep wake cycle.
      • This was shown by STIFFRE
        • a cave expert who investigated the natural duration of his own sleep-wake cycle.
          • Isolated himself from all daylight by hiding in a dark cave with only weak artificial light, which came on when he woke.
            • Findings - his sleep-wake cycle settled naturally at around 25 hours, although it would range up to 48 hours.
              • Concluded that the absence of natural daylight allowed his biological clock to run at its natural rate.
                • Daylight acted as an exogenous zeitgeber
                  • Sample size was small and study doesn't consider individual differences.
                    • Wasn't completed isolated from all exogenous zeitgebers.
                      • given researchers a better understand of the adverse consequences that occur as a result of their disruption
                        • Night workers engaged in shift work experiencewould have a period of reduced concetration around 6 in the monring
                          • Meaning mistakes and accidents are more likely
                            • Relationship between shift work and poor health, suggesting that shift workers are 3 times more likely to develop heart disease.
  • Findings - his sleep-wake cycle settled naturally at around 25 hours, although it would range up to 48 hours.
    • Concluded that the absence of natural daylight allowed his biological clock to run at its natural rate.
      • Daylight acted as an exogenous zeitgeber
        • Sample size was small and study doesn't consider individual differences.
          • Wasn't completed isolated from all exogenous zeitgebers.
            • given researchers a better understand of the adverse consequences that occur as a result of their disruption
              • Night workers engaged in shift work experiencewould have a period of reduced concetration around 6 in the monring
                • Meaning mistakes and accidents are more likely
                  • Relationship between shift work and poor health, suggesting that shift workers are 3 times more likely to develop heart disease.

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