Biological Rhythms Flashcards
(9 cards)
1
Q
How often do Circadian rhythms operate?
A
On a 24 hour cycle e.g. sleep-wake cycle
2
Q
How often do Infradian rhythms operate?
A
Over 24 hours e.g. menstrual cycle
3
Q
How often do Ultradian rhythms operate?
A
Less than 24 hours e.g. stages of sleep like REM
4
Q
What study was done on Circadian rhythms?
A
Siffre (1973)
5
Q
What was Siffre’s study?
A
He spent 2 months in a cave deprived of light and sound
6
Q
What were Siffre’s findings?
A
That his sleep-wake cycle remained between 24-25 hours
7
Q
What is an example of something that can change Circadian rhythms?
A
Night shifts or jet lag
8
Q
What detects the level of light present?
A
Suprachiasmatic Nuclei (SCN) in the hypothalamus
9
Q
A
