Psychology - Biorhythms studies Theme A

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  • 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
      • 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
      • 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
    • 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
      • Exogenous Zeitgebers
        • Boivin et al
          • Circ rhythms can be entrained by dim lighting - bright lighting more effective
    • 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%
      • 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

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