Sleep

Created by: hrweaver
Created on: 30-12-13 19:37

What is a circadian rhythm?

A cycle once every 24 hours

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What was Micheal siffre's aims, procedures and findings?

A: To find out long the sleep/wale cycle is without external influences. P: Spent time in caves around the world like in the southern alps where he resurfaced thinking it was 17 sept but it was actually the 20 august. F: circadian rhythm was 24-25hrs

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Who's research supported Michael Siffre?

Aschoff and Wever

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What did folkard et al do and find?

Experiement to see if ex. cues could override circadian rhythms. 12 people in a cave for 3 weeks. Went to bed when clock said 11:45pm+got up at 7:45am. Clock then sped up to 22hr day. Rhythms at first followed 22hr but reverted to 24hr

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What is the best indicator of circadian rhythms?

Core body temperature

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When is body temperature lowest and highest?

Lowest at 4:30am (36 degrees) Highest at 6pm (38 degrees)

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When is there a 'trough' in body temperature?

Just after lunch, even if you havent eaten

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When is cortisol highest and lowest?

Highest at 6am and lowest at 12 midnight

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What hormones peak at midnight?

growth hormone and melatonin

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Why is there said to be flaws in research in to circadian rhyt,ms sleep/wake cycle? What researcher said this?

Humans still had artificial light in the caves. Czeisler said you can change a persons sleep/wake cycle from 22-28hours using atrificial light

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What are the two important individual differences in people relating to the sleep/wake cycle?

Length of cycle- can vary from 13-65hrs. People's rhythms peak at different times- (Duffy) Are you a morning person or late night person?

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Who says that temperature is linked to lower cognitive ability?

Folkard. Children's recall was better when they were read to at 3pm rather than 9am

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What were the bad things about Michael Siffres research?

Case study, individual differences

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What did Gresbrecht find?

lower body temp equals lower performance on cognitive tasks

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What was Micheal siffre's aims, procedures and findings?

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Card 3

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Who's research supported Michael Siffre?

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Card 4

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What did folkard et al do and find?

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Card 5

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What is the best indicator of circadian rhythms?

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