nature of sleep
- Created by: Molly
- Created on: 26-11-12 15:19
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- nature of sleep
- types of sleep
- electroenceph- alograph (EEG), uses electrodes on the scalp to record the electrical activity of the brain. (Berger 1929) identified 2 types.
- desynchronised EEG- usually recorded when someones awake,
- synchronised EEG- indicates that millions of neurons firing together in unison. usually recorded when someone is asleep
- non rem sleep (NREM)
- when we first fall asleep EEG is dominated by larger slower waves as we enter NREM. four stages to NREM
- respiration, heart rate and blood pressure fall. blood flow to the brain slows, indicating the brain is becoming less active.
- rapid eye movement sleep (REM)
- ASERINSKY AND KLIETMAN (1953) AND DEMENT AND KLIETMAN (1957)
- found that falling through the stages of NREM sleep into deep stage 4, sleep would lighten and move back up to NREM stage 2.
- at this point EEG becomes fast and desynchronised however muscles relax and also movements form the eyes
- ASERINSKY AND KLIETMAN (1953) AND DEMENT AND KLIETMAN (1957)
- dreaming
- REM sleep associated with dreaming. by waking participants they established those woken during REM reported dreaming 80%of the time, those woken during NREM reported dreaming only 20%.
- one problem with this label that REM and dreaming are very different, REM is a physiological state and dreams are subjective.
- electroenceph- alograph (EEG), uses electrodes on the scalp to record the electrical activity of the brain. (Berger 1929) identified 2 types.
- types of sleep
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