Mammals have around 100 different bio circadian rhythms
1 of 20
Wever 1979
Reviewed studies of people who spent long periods without exogenous zeitgebers and found out that their sleep wake cycle settled down to about 25 hours rather than 24 (backs up Siffra)
2 of 20
Reinberg 1967
Documented menstrual cycles (infradian rhythm) of women who lived on care for 3 months and found that their menstrual cycles shortened and sleep/wake cycle got longer
3 of 20
Russel
Sweat pads on lip, pheromones allowed womens menstrual cycles to synchronize
4 of 20
Turke
Evolutionary advantages to synchronized cycles such childcare duties as pregnancies at the same time meaning women can share
5 of 20
Morgan 1995
Removed the SCN from hamsters and found that they lost their circadian rhythms, they returned after the SCN was restored
6 of 20
Miles 1977
Man who had been blind from birth (no exogenous zeitgebers) had a 24.9 hour sleep/wake cycle (circadian rhythm) which means that light is a dominant zeitgeber as tv and clocks did not change this
7 of 20
Luce+Segal 1966
People who live in the arctic where in the summer months the sun does not set slept normally despite no zeitgebers
8 of 20
Klein 1972
Phase Delay (east to west) is easier to recover- longer day
9 of 20
Schwartz 1995
Baseball games- teams who traveled west to east had fewer wins, this is reductionist
10 of 20
Cho 2001
reduction in temporal lobe size and memory functioning in pilots who regularly cross timezones
11 of 20
Dawson+Campbell 1991
exposed shift worker to four hours of very bright light which helped their circadian rhythms to change quicker
12 of 20
Dement+Kleitman 1957
Sleep is an ultradian rhythm with 5 stages which together last about 90 minutes and the cycle is repeated 5/6 times a night
13 of 20
Zimbardo
Babies spent more time in REM sleep than adults because need more stress to be released, learn more everyday which takes away energy that needs to be restored ect
14 of 20
Meddis 1975
At night prey animals can't see predators and remaining still could be an advantage to survival THEREFORE prey should only sleep at night and predators should not sleep at all which is not the case
15 of 20
Siegel 2005
Sleep is adaptive as is conserves energy, especially for small new born mammals with high metabolism and predators who need to spend a lot of energy catching food- no empirical evidence
16 of 20
Empson 1989
Sleep is universal among animals, even among the most successful predators
17 of 20
Horne 1988
Universal theory is pointless as there's different reasons for different species
18 of 20
Oswald 1970
NREM sleep is for restoring body functions and REM for brain processes
19 of 20
Bloch 1979
rats who performed complex activities had much more REM sleep
20 of 20
Other cards in this set
Card 2
Front
Reviewed studies of people who spent long periods without exogenous zeitgebers and found out that their sleep wake cycle settled down to about 25 hours rather than 24 (backs up Siffra)
Back
Wever 1979
Card 3
Front
Documented menstrual cycles (infradian rhythm) of women who lived on care for 3 months and found that their menstrual cycles shortened and sleep/wake cycle got longer
Back
Card 4
Front
Sweat pads on lip, pheromones allowed womens menstrual cycles to synchronize
Back
Card 5
Front
Evolutionary advantages to synchronized cycles such childcare duties as pregnancies at the same time meaning women can share
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