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8 Cards in this Set
- Front
- Back
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Circadian rhythms |
cycles of activity that repeat over 24h (e.g. sleep/wake c) |
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Endogenous pacemakers |
internal factors that affect biological rhythms |
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AO3 Support for EPs/internal body clock |
Siffre- 2months in dark cave; lost concept of time but body naturally developed 25h sleep/wake cycle; internal body clock does influence cycle |
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Main endogenous pacemaker- the SCN |
cluster of nerves in hypothalamus that detects light via optic nerve lack of light->SCN stimulates pineal gland for melatonin->inhibits brain mechanisms promoting alertness->drowsy and ready for sleep |
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AO3- Empirical support for SCN |
Morgan- removed scn from hamsters and circ rhythm disappeared; put back-reappeared |
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Exogenous pacemakers |
external factors affecting or entraining bio rhythms- main=light day=no melatonin |
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AO3- Research support for light |
Campbell & Murphy- light->back of knees (high blood flow) for 3h. Ppts w no light on knees=higher levels of melatonin-> light resets SCN |
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AO3-support for social cues |
Luce & Segal- arctic circle inhabitants still sleep for 7 hours a night in summer when no darkness- use mealtimes and other soc customs to regulate circ rhythms |
