Ch9 - Sleep Mechanisms Chapter 9 What is sleep A Sleeping...

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Sleep Mechanisms Chapter 9
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What is sleep? A Sleeping Lion (www.istockphoto.com) A Baby sleeping (www.blondenyko.spaces.live.com) Fig 9.4 Nightmares
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www.health.howstuffworks.com Stages of Sleep Non-REM sleep REM (Rapid Eye Movement) sleep
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How do we measure sleep? Electro-encephalogram (EEG) An electrical brain potential recorded by placing electrodes on the scalp. Electromyogram (EMG) An electrical potential recorded from an electrode placed on or in a muscle (usually neck or chin muscle). Electro-oculogram (EOG) An electrical potential from the eyes, recorded by means of electrodes placed on the skin around them; detects eye movements.
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Fig 9.1 Sleep recording in a human subject in a sleep lab
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Brain electrical activity during Sleep Alpha activity -S m o o t h electrical activity; generally associated with a state of relaxation . Delta activity - Regular synchronous electrical activity; occurs during the deepest stages of slow-wave sleep. Theta activity - EEG activity of low frequency that occurs intermittently during early stages of slow-wave sleep and REM sleep . Beta activity - Irregular electrical activity; generally associated with a state of arousal or REM sleep .
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EEG Recording of stages of sleep Fig. 9.2 Synchronized Desynchronized Non-REM sleep Stage 1 Stage 2 Stage 3 Stage 4 REM sleep Slow Wave Sleep Deep Sleep
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Basic rest-activity cycle A 90-minute cycle (in humans) of waxing and waning alertness, which controls cycles of REM sleep and slow-wave sleep. A typical pattern of stages of sleep Fig 9.3
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Principal differences between REM and non-REM sleep REM sleep non-REM sleep 6. Associated with dreams 6. Dreams generally absent 5. Penile erection or vaginal secretions 5. Absence of genital activity
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This note was uploaded on 03/24/2009 for the course PGS 24674 taught by Professor Biswas during the Spring '09 term at ASU.

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Ch9 - Sleep Mechanisms Chapter 9 What is sleep A Sleeping...

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