Chapter 6 - 1 1 States of Consciousness Chapter 6 2 Sleep...

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Unformatted text preview: 1 1 States of Consciousness Chapter 6 2 Sleep & Dreams Sleep – the irresistible tempter to whom we inevitably succumb. Mysteries about sleep and dreams have just started unraveling in sleep laboratories around the world. 3 Biological Rhythms and Sleep Circadian Rhythms occur on a 24-hour cycle and include sleep and wakefulness. Termed our “biological clock,” it can be altered by artiFcial light. Light triggers the suprachiasmatic nucleus to decrease (morning) melatonin from the pineal gland and increase (evening) it at night fall. 4 2 5 Measuring sleep: About every 90 minutes, we pass through a cycle of Fve distinct sleep stages. Sleep Stages 6 Awake but Relaxed When an individual closes his eyes but remains awake, his brain activity slows down to a large amplitude and slow, regular alpha waves . A meditating person exhibits an alpha brain activity. 7 During early, light sleep (stages 1-2) the brain enters a high-amplitude, slow, regular wave form called theta waves . A person who is daydreaming shows theta activity. Sleep Stages 1-2 8 During deepest sleep (stages 3-4), brain activity slows down. There are large-amplitude, slow delta waves . Sleep Stages 3-4 2 5 Measuring sleep: About every 90 minutes, we pass through a cycle of Fve distinct sleep stages. Sleep Stages 6 Awake but Relaxed When an individual closes his eyes but remains awake, his brain activity slows down to a large amplitude and slow, regular alpha waves . A meditating person exhibits an alpha brain activity....
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This note was uploaded on 04/07/2008 for the course PSYCH 100 taught by Professor Cave during the Spring '08 term at UMass (Amherst).

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Chapter 6 - 1 1 States of Consciousness Chapter 6 2 Sleep...

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