Biological Rhythms 2.0 / 5 based on 1 rating ? PsychologyA2/A-levelAQA Created by: RyanCreated on: 03-12-12 21:01 Definition of a biological rhythm A cyclical variation over some period of time in physiological or psychological processes. - Gross and McIlveen (1996)! 1 of 5 Circadian Rhythm Occurs every 24 hours. Example: Sleep wake cycle, temperature (lowest at night) and metabolism (peaks and drops) 2 of 5 Ultradian Rhythm Occurs more than once in 24 hours. Example: Sleep cycles, activity and rest cycles, eating and hunger 3 of 5 Infradian Rhythm Occurs less than once every 24 hours. Example: Menstural cycle, seasonal affective disorder 4 of 5 What are the rhythms controlled by? A relationship between endogenous pacemakers and exogenous zeitgebers 5 of 5
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