Circadian rhythm Flashcards
How long does a circadian rhythm last?
Biological rhythm that lasts 24 hours e.g. sleepwake cycle.
What was SIFFRE’s study on circadian rhythms?
Spent several periods UNDERGROUND to study effects of his OWN bio rhythm.
ISOLATED from natural LIGHT, which we know is an e.z that affects sleepwake cycle.
each time his “Free-running” bio rhythm settled down to one of 25 hours. He continued to sleep-wake on a regular basis.
Who else found similar results to Siffre and what were they?
Aschoff and WEver found that on their study on a group of ppts, 4 weeks in a bunker isolated from nautal light, one ppt circadian rhythm switched to 29 hours and the rst 24-25 hours.
Overall, what were Siffre and the others findings from their study on circadian rhythms?
That out natural circadian rhythms are LONGER than 24 hours and is ENTRAINED by exogenous zeitgeber such as light and social cues to FIT a 24 hour day.
