Circadian, Infradian and Ultradian Rhythms (OCR A-Level Psychology): Flashcards
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Biological rhythms definition
Biological rhythms definition
Patterns of changes in body activity that occur in cyclical periods
Circadian rhythm cycle duration
Circadian rhythm cycle duration
24 hours
Ultradian rhythm frequency
Ultradian rhythm frequency
More than once every 24 hours
Sleep cycle duration (ultradian)
Sleep cycle duration (ultradian)
90 minutes
Infradian rhythm frequency
Infradian rhythm frequency
Less than once every 24 hours
Examples of infradian rhythms
Examples of infradian rhythms
Menstrual cycle, seasonal affective disorder (SAD)
Number of recognised sleep stages
Number of recognised sleep stages
Five
Stage 5 of sleep
Stage 5 of sleep
REM sleep, stage in which dreaming occurs
Stages 3 and 4 of sleep
Stages 3 and 4 of sleep
Delta waves of deep sleep
Siffre's circadian rhythm in cave
Siffre's circadian rhythm in cave
24-25 hours
Ultradian rhythm research limitation
Ultradian rhythm research limitation
Low ecological validity - monitors affect natural sleep patterns
Russell et al study year
Russell et al study year
1980
Russell et al finding on menstrual cycles
Russell et al finding on menstrual cycles
Synchronised via pheromones (exogenous factor)