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PSYC 1010 - Test 2 Notes (Summer 2011)

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PSYC 1010
Jennifer Steele

PSYC 1010Test 2 NotesChapter 5 Variations in Consciousness The Nature of ConsciousnessBiological Rhythms and SleepConsciousness is the continually changing stream of mental activityCircadian Rhythms influences the cycles of sleep and wakefulness occurs about once per day Exposure to light resets biological clocks by affecting the activity of the suprachiasmatic nucleus in the hypothalamus and the pineal gland which secretes melatonin at night Jetlag and sleep deprivation is often the byproducts of unsynchronized Circadian Rhythms and can cause serious implications in memory and attention Melatonin can be used to treat such byproducts of synchronization difficultiesIf no natural light exist then our natural clocks are affected and possibly altered During sleep our brain remains active and has its own cues Case Study Siffres 25hour dayInfradian Rhythms occurs less than once a day but more than once a year Menstruation and hibernation are some examples Ultradian Rhythms occur more than once a day Heartbeat and respiration are also common examples of suchElectroencephalogram EEG can measure sleep through voltages and waveforms Sleep and Waking CyclesDuring a nights sleep a series of 90minute sleep cycle stages take placeRapid Eye Movement REM sleep is often associated with dreams and waking thoughtsREM sleep declines as the person gets older But REM cycles 4 rarely changeRestoration Theory Body needs to rest and recover Regular exercise can help sleepPreservation Theory Why risk being killed if you can only get food in the day
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