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What are biological rhythms?
Distinct patterns of change in body activity that conform to cyclical time periods.
What are endogenous pacemakers?
Internal biological ‘clocks’
What are exogenous zeitgebers?
External changes in the environment
What are ultradian rhythms?
Rhythms occurring during the day
What are infrafian rhythms?
Rhythms taking longer than a day to complete
What is the sleep/wake cycle governed by?
the SCN (suprachiasmatic nucleus)
What can reset the SCN
Exogenous zeitgebers (light)
Who did the cave study?
Michel Siffre
What is a strength of research into circadian rhythms?
It has been used to improve medical treatments
What is the menstrual cycle an example of?
An infradian rhythm.
What kind of system is the menstrual cycle?
An endogenous system (though evidence suggests it may be influenced by exogenous factors)
What kind of biological rhythm is SAD (seasonal affective disorder)?
A circannual rhythms (subject to a yearly cycle). It can also be classed as circadian as the experience of SAD may be due to disruption of the sleep/wake cycle (attributed to prolonged daily darkness in winter)
What kind of rhythm is the stages of sleep?
Ultradian rhythm
WHat has research into ultradian rhythms helped us understand?
Age-related changes in sleep
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