Biological Rhythms 0.0 / 5 ? PsychologyBiological RhythmsA2/A-levelAQA Created by: meCreated on: 30-12-13 10:32 The three types of biological rhythms circadian, infradian, ultradian 1 of 13 Circadian Occur every 24 hours E.G: sleep-wake cycle 2 of 13 Infradian Occur less frequently than once daily E.G: menstrual cycle 3 of 13 Ultradian Occur more than once daily E.G: sleep cycle (stages of sleep) 4 of 13 Endogenous Pacemakers: Internal Clock SCN acts as internal clock to keep body on 24 hour sleep-wake cycle 5 of 13 Endogenous Pacemakers: Melatonin When there is light its released thus inducing sleep and vice versa 6 of 13 Exogenous Zeitgebers light, Siffre 6months in a cave, sleep-wake extended to 25-30 hours due to no light 7 of 13 Pengelly and Fisher: Support for endogenous Squirrels hibernate in lab conditions due to hibernation being endogenous 8 of 13 Humans: Support for exogenous humans adapt to their environment and are able to stay awake when necessary 9 of 13 Disrupting biological rhythms jet lag, shift work 10 of 13 Disrupting biological rhythms: Jet lag change in time zone leaves you out of sync, Schwartz found teams travelling east to west got better results than the other way round 11 of 13 Disrupting biological rhythms: Shift work mixing up of the rhythms, czeisler studies workers whos shift patterns caused health problems, changes were made to allow more time to adapt(IDA) 12 of 13 Research limitations animal studies, deprived of natural light studies still use artificial light, individual differences, 13 of 13
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