Psyc ch4 sum - Psychology Chapter 4 Consciousness Sleep Dreams Hypnosis and Drugs Chapter Summary WHAT IS CONSCIOUSNESS 4.1 What does it mean to be

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Psychology Chapter 4: Consciousness: Sleep, Dreams, Hypnosis, and Drugs Chapter Summary WHAT IS CONSCIOUSNESS? 4.1 What does it mean to be conscious, and are there different levels of consciousness? Consciousness is a person’s awareness of everything that is going on at any given moment. Most waking hours are spent in waking consciousness. Altered states of consciousness are shifts in the quality or pattern of mental activity. ALTERED STATES: SLEEP 4.2 Why do people sleep, and how does sleep work? Sleep is a circadian rhythm, lasting 24 hours, and is a product of the activity of the hypothalamus, the hormone melatonin, the neuro-transmitter serotonin, and body temperature. 4.3 What is the purpose of sleep? Adaptive theory states that sleep evolved as a way to conserve energy and keep animals safe from predators that hunt at night. Restorative theory states that sleep provides the body with an opportunity to restore chemicals that have been depleted during the day as well as the growth and repair of cell tissue. The average amount of sleep needed by most people is about 7 to 8 hours within each 24-hour period. 4.4 What are the different stages of sleep? Stage One sleep is light sleep.
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Stage Two sleep is indicated by the presence of sleep spindles, bursts of activity on the EEG. Stage Three is highlighted by the first appearance of delta waves, the slowest and largest waves, whereas Stage Four is predominantly delta waves, and the body is at its lowest level of functioning. Sleepwalking and sleeptalking occur in Stage Four sleep. Night terrors are attacks of extreme fear that the victim has while sound asleep. 4.5 What is dreaming, and what happens if people don’t dream? REM sleep occurs four or five times a night, replacing Stage One sleep in the
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This note was uploaded on 10/23/2009 for the course PSYCH 101 taught by Professor Nahad during the Fall '07 term at Ivy Tech Community College.

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Psyc ch4 sum - Psychology Chapter 4 Consciousness Sleep Dreams Hypnosis and Drugs Chapter Summary WHAT IS CONSCIOUSNESS 4.1 What does it mean to be

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