BioRhythms

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Circadian Rhythm
Approx 24hrs, example is the sleep-wake cycle.
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Infradian Rhythm
More than one day, example is the menstrual cycle.
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Ultradian Rhythm
Less than one day, example is sleep and the stages of sleep.
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Siffre 1975
6 month isolation study inside a cave with no exogenous zeitgebers where he found that his circadian rhythm was approx 25hrs but exogenous zeitgebers change our internal clock to 24hrs.
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Exogneous Zeitgebers
External cues such as light or sound.
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Endogenous Pacemakers
Free running internal mechanism
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Other cards in this set

Card 2

Front

More than one day, example is the menstrual cycle.

Back

Infradian Rhythm

Card 3

Front

Less than one day, example is sleep and the stages of sleep.

Back

Preview of the back of card 3

Card 4

Front

6 month isolation study inside a cave with no exogenous zeitgebers where he found that his circadian rhythm was approx 25hrs but exogenous zeitgebers change our internal clock to 24hrs.

Back

Preview of the back of card 4

Card 5

Front

External cues such as light or sound.

Back

Preview of the back of card 5
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