PSYA3 Biorhythms and sleep

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Siffre
spent 61 days in cave isolated from exogenous cues, natural circadian sleep-wake cycle kept to around 24 hours
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Aschoff and Wever
ppt in WW2 bunker, absence of social/time cues, sleep-wake cycle of 24-25 hours remained, free running cycle
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Folkard et al.
Learning abilities of 12 - 13 year olds, superior recall when core body temperature was highest at 3pm than lower at 9am
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Czeisler
alteration of circadian rhythms using dim light, 22 to 28 hours, issues with methodology of Siffre + Aschoff, were exposed to dim artificial light
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Hord and Thompson
No correllation between body temp and cognitive performance, said that increased temperature may lead to physiological arousal, which leads to improved cognition
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Dement and Kleitman
Dream Sleep: woke ppt when brainwaves indicated REM sleep, likely to report dreaming, however, dreaming was reported outside of REM sleep
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Russell
Exogenous cues in menstrual cycle, rubbed sweat from one group of women onto top lips of another group, menstrual cycles synchronised, infradian rhythm altered by pheromones
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Campbell and Murphy
exogenous ZG, shining light on backs of knees, can shift circadian rhythms, light effects cryptochrome protein, resets SCN
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Morgan
Hamsters bred with mutant SCN's to have 20 hour rhythms, transplant scn's into other hamsters, showed mutant rhythms
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DeCoursey
chipmunks, lesioned SCN with no CR, more lesioned chipmunks were killed by weasels, SCN has adaptive advantage, predator avoidance
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Boivin
artificial light, very bright light has significant effect on resetting biological clocks
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Recht
Jet Lag: Baseball teams in US, performed better when flying from east to west (phase advance)
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Bambra
forward rotating shifts = less damaging to health, follow logical order of day
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Petrie
Melatonin, used as 'cure' for shift and jet lag, effective for naturally inducing sleep just before bedtime
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Tynjala
Cross cultural study, adolescents from korea and iran = avg 6.5 hours of sleep, vastly different to european
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Siegel
REM sleep allows break in neurotransmitter secretion, neurones can regain their sensitivity.
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Rechtschaffen
rats deprived of sleep for 33 days on rotating disc, died after, could've been from exhaustion, not sleep deprivation
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Peter Tripp
sleep deprived for 201 hours, paranoia and hallucinations, and sleeping branwaves, but no long term damage after 24h sleep
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Zepelin and Rechtschaffen
smaller animals = slept more due to higher metabolic rates
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Capellini
trade off between foraging requirements and sleep, low energy diets or high metabolic rate = less sleep, -ve correllation between body size and sleep
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Allison and Cicchetti
animals with higher predation risk = slept less, exceptions = rabbits. Larger animals = less NREM sleep, shows NREM sleep is important for energy conservation
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Savard
fewer immune cells in insomniacs, insomniacs mor vulnerable to physical illness
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Spielman and Glovinsky
3P model of insomnia, predisposing, precipitating and perpetuating
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Oliviero
children, have not properly developed systems to inhibit motor activity during SWS, found immaturity in these neural circuits in sleepwalking adults
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Lecendreux
50% concordance rate for MZ twins for sleepwalking, also identified a gene critical for sleepwalking
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Card 2

Front

ppt in WW2 bunker, absence of social/time cues, sleep-wake cycle of 24-25 hours remained, free running cycle

Back

Aschoff and Wever

Card 3

Front

Learning abilities of 12 - 13 year olds, superior recall when core body temperature was highest at 3pm than lower at 9am

Back

Preview of the back of card 3

Card 4

Front

alteration of circadian rhythms using dim light, 22 to 28 hours, issues with methodology of Siffre + Aschoff, were exposed to dim artificial light

Back

Preview of the back of card 4

Card 5

Front

No correllation between body temp and cognitive performance, said that increased temperature may lead to physiological arousal, which leads to improved cognition

Back

Preview of the back of card 5
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