Biological rhythms studies

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What did Miles et al find? (endogenous and exogenous)
Blind people show the same pattern as sighted people, suggesting although external factors may be important there are also endogenous pacemakers
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What did Sackett & Korner do?(endogenous & exogenous)
Investigated circadian rhythms in conjoined twins who share the same blood (melatonin circulate in the blood)
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What did Sackett & Korner find? (endogenous & exogenous)
They did not share the same Circadian Rhythm, so melatonin is not the sole factor or they would've had the same rhythm
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What did Folkard find? (endogenous & exogenous)
After 25 days in a cave, Kate Aldcroft's body temperature adopted a 24-hour rhythm, yet her sleep showed alteration on 30 hours, Shows that the SCN controls diff rhythms in diff ways
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What did Morgan do? (endogenous & exogenous)
SCN from mutant hamsters who had 20 hour CR transplanted into normal hamsters(24hour rhythm)
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What did Morgan find? (endogenous & exogenous)
The hamsters showed the mutant 20 hour cycle gene, showing that the SCN is a vital factor off regulating cicadian rhythms
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What did Decoursey find about chipmunks? (endogenous & exogenous)
Destroying chipmunks SCN made them more active at night compared to normal chipmunks, showing that the SCN has an impact on the behaviour of animals
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What did Tynjala do?(endogenous & exogenous)
Looked at sleeping patterns in adolescents living in diff cultures, 400,000 11-16YO from 11 EU countries
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What did Tynjala find? (endogenous & exogenous)
A significant difference between them. An importand tributer was the amount of evenings spent outside the home, which meant the younger people went to bed late and had too little sleep because had to get up early
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What did Shin et al find? (endogenous & exogenous)
In Korea the mean sleep time was recorded at 6.5 hours for adolescence
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What did Ghanizaden find? (endogenous & exogenous)
The mean time in Iran was 7.7 hours
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What did Recht et al do? (distruptions)
Analysed US basketball results over a 3 year period
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What did Recht find? (distruptions)
Teens who travelled east to west won 44% of games, where as those travelling west to east only won 37%
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What did Winter et al find? (distruptions)
Calculated it takes one day to adjust to each hour of time changed
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What did Knutsson et al find? (distruptions)
Individuals working shifts for 15+ years are 3 x more likely to develop heart disease
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What did Martino et al find? (distruptions)
Linked shift work to a range of organ disease including kidney disease, may be due to desynchronising or indirect effects eq sleep distruption
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What did Reinberg find? (distruptions)
Those who gave up shift work bcos they couldnt copehad rhythms that changed a lot. Those on shift work while happy had unchanging rhythms
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What did Boivin do? (distruptions)
31 males in 4 groups exposes to diff evels of light. Measuring core body temp
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What did Boivin find? (distruptions)
Bright light = Advanced, Dim light = Drifted 1hr later in CR, Shows lighting can have an effect on CR & very bright light has an effect
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What did Folkard do? (circadian)
Looked at learning ability pf 12 & 13 YO who stories read to them at either 9am or 3pm
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What did Folkard find?(circadian)
1 week later the afternoon group (highest core body temp) showed superior recall and retained more than 8% more meaningful material, hence long term recall is best when body temp is highest
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What did Gupta find? (circadian)
Performance on IQ tests was best at 7pm than 9am and 2pm
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What did Ciesbrecht find? (circadian)
Put Ps in cold water (to lower body temp) finding cognitive performance was worse on some tasks
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What did Iford and Thompson find? (circadian)
Tested cog performance in a field rather than lab, finding no correlation between core body temp and cog performance
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What did Aschoff & Wever do? (circadian)
Placed ps under ground in a WW2 bunker in absence of any social cues
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What did Aschoff & Wever find? (circadian)
Found that ps rhythms between 24 &25, however some as long as 29 hours
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What did Reinberg find? (infradian & ultadrian)
A women who spent 3 months in a cave hdeveloped a shortening of her menstrual cycle and it took a while to revert to normal afterwards
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What is phototherapy found by Barlow and Durand? (infradian & ultadrian)
Use of very strong light, of between 6,000 & 10,000 lux, in evening and early morning to change levels of melatonin and serotonin
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What did Eastman find?
A placebo effect was less effective but 32% of ps improved
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Card 2

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What did Sackett & Korner do?(endogenous & exogenous)

Back

Investigated circadian rhythms in conjoined twins who share the same blood (melatonin circulate in the blood)

Card 3

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What did Sackett & Korner find? (endogenous & exogenous)

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Preview of the front of card 3

Card 4

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What did Folkard find? (endogenous & exogenous)

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Card 5

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What did Morgan do? (endogenous & exogenous)

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