Psychology - Biorhythms studies Theme A
- Created by: Nashaan
- Created on: 29-05-13 11:25
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- Biorhythms Theme A
- Types of Rhythm
- Circadian
- Siffre
- Spent 6 months in a cave, no external cues - Believed less days had passed therefore endogenous clock works faster. HOWEVER had artificial lighting
- Aschoff + Weaver
- ppts in underground WWII bunker - displayed rhythms of 24-25 hrs. Some 29 hrs
- Folkard
- 12 people isolated 3weeks. Clock indicated 11:45pm + 7:45am. Gradually quickened but rhythms stayed 24hrs
- Siffre
- Infradian
- McClintock + Stern
- Women wore alcohol soaked pad under armpit. Inhaled secretions from women about to ovulate - Menstrual cycle shorter. Inhaled secretions from those finished ovulating - Cycle longer.
- Russell et al
- Sweat collected from one group of women, rubbed on upper lip of another group - Cycles synchronised
- McClintock + Stern
- Ultradian
- Dement + Kleitman
- Woke ppts when brain waves showed REM - ppts likely to report dreaming
- Friedman + Fisher
- Observed eating+drinking behaviour of psychiatric patients - clear 90min cycle
- Dement + Kleitman
- Circadian
- Ep's + Ez's
- Endogenous pacemakers
- Morgan
- Mutant hamsters - 20hr cycle. SCN into normal hamsters - displayed 20hr cycle also
- Decoursey
- Removed SCN 30 chipmunks - returned to habitat, killed by weasels as stayed awake
- Morgan
- Exogenous Zeitgebers
- Boivin et al
- Circ rhythms can be entrained by dim lighting - bright lighting more effective
- Boivin et al
- Endogenous pacemakers
- Disrupting Rhythms
- Jet lag
- Winter
- SCN several cycles to resynchronise =1day. Symptoms-nausea, fatigue, insomnia etc
- Recht et al
- Baseball results - teams travelling east-west=phase delay won 44%. Teams travelling west-east=Phase advance won 37%
- Winter
- Shift work
- Boivin et al
- Night workers exp 'trough' of decreased alertness, cortisol levels low midnight-4am
- Reinberg
- People who gave up shift work-Rhythms changed a lot. 'Happy shift workers'-Unchanged rhythms
- Knuttson
- Individuals who worked shifts 15yrs+ 3xs more likely to develop heart disease
- Boivin et al
- Jet lag
- Types of Rhythm
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