Biological Rhythms (OCR A-Level Psychology): Quizzes

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The Effect of Endogenous Pacemakers & Exogenous Zeitgebers
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What are endogenous pacemakers?

Internal body clocks governing rhythms

Which of the following is an example of an endogenous pacemaker?

The SCN (suprachiasmatic nucleus)

What are exogenous zeitgebers?

External changes resetting body clock

Which of these are examples of exogenous zeitgebers?

Light and noise

How long did participants spend in the bunker in Aschoff & Wever's study?

Four weeks

What circadian rhythm did most participants display in Aschoff & Wever's study?

Between 24-25 hours

What do both Siffre's and Aschoff & Wever's studies suggest about the sleep-wake cycle?

It may be slightly longer than 24 hrs

How do exogenous zeitgebers help our internal body clock?

Synchronise it with the 24-hour day

What is a limitation of research on endogenous pacemakers and exogenous zeitgebers?

They can't be studied in isolation

Why wasn't Siffre's isolation study truly isolated?

He used artificial light

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