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12 cards from this deck
Endogenous pacemakers & exogenous zeitgebers
Internal body clocks that govern biological rhythms
SCN (suprachiasmatic nucleus)
External environmental changes that reset the body clock
Light, noise
WWII bunker deprived of natural light
Four weeks
All but one participant had 24-25 hr rhythm
Slightly longer than 24 hours
Synchronise internal clock to 24-hour day
Pacemakers & zeitgebers can't be studied in isolation
They interact; separating them makes little sense
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