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Chapter 4Q - Consciousness Consciousness State of awareness...

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Consciousness
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Consciousness State of awareness of ourselves and of the world around us Awareness of cognitive processes Thoughts, feelings, sensations, and perceptions of outside world What you are aware of at a particular point in time Waking consciousness Shifts thru day: from alert wakefulness, to drifting consciousness to unconsciousness during sleep
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Circadian Rhythm Melatonin: day: production drops, increases without daylight, sleepiness Jet Lag
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Unconsciousness Responsive to important or relevant stimuli Alarm clock Child’s cry Spend 1/3 of lives sleeping
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Stages of Sleep EEG: electroencephalograph Tracks brain waves Intensity (height) and frequency (waves cycles per second) Awake Beta waves Low amplitude Relaxed wakefulness (twilight stage) Closed eyes, relaxed in bed Slower rhythmic cycles Alpha waves
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Stages of Sleep Stage 1 Small irregular waves Easily awakened Stage 2 2 minutes after stage 1
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