States of Consciousness
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1 States of Consciousness
2 Sleep, Dreams, and Body Rhythms
3 Introduction
4 Consciousness Awareness of oneself and one s environment
5 Body Rhythms
6 Biological Rhythms Periodic physiological fluctuations Can affect physiological functioning Fall into three main categories Circadian Rhythms Ultradian Rhythms Infradian Rhythms
7 Circadian Rhythms Biological rhythms that occur approximately every 24 hours Example: Sleep-wake cycle
8 Sleep and Circadian Rhythms Play Sleep and Circadian Rhythms (6:09) Module #13 from The Brain: Teaching Modules (2 nd edition).
9 Ultradian Rhythms Biological rhythms that occur more than once each day Example: Stages of sleep throughout the night
10 Infradian Rhythms Biological rhythms that occur once a month or once a season Example: Women s menstrual cycle
11 Sleep and Sleep Deficit
12 Sleep Deprivation Effects Decreases efficiency of immune system functioning Safety and accident issues Contributes to hypertension, impaired concentration, irritability, etc.
13 Why We Sleep
14 Hypothalamus Sleep control center in the brain Monitors changes in light or dark in the environment Changes levels of hormones in the body
15 Melatonin A hormone that helps regulate daily biological rhythms Linked to the sleep-wake cycle Melatonin level increases during the night and decreases with exposure to morning light
16 Reasons for Sleep Two primary reasons: Preservation: keep us protected from the dangers of the night Restoration: recuperate from the wear and tear of the day
17 Sleep Stages, REM, and Dreaming: The Stages of Sleep
18 Electroencephalograph (EEG) A machine that amplifies and records waves of electrical activity that sweep across the brain s surface Electrodes are placed on the person s scalp to measure the waves Used as a means to measure the stages of sleep
19 EEG
20 Stage 1 Sleep Breathing is slowed. Brain waves become irregular. It is easy to wake the person, who will insist they are not asleep. Person will report they have dreamlike sensations, such as falling.
21 Stages of Sleep
22 Stage 1
23 Stage 2 Sleep Brain wave cycle slows. EEG spindles (small brain wave bursts) develop. First time through stage 2 last about 20 minutes.
24 Stage 2
25 Stages 3 and 4 Sleep Increase in delta waves (large and slow waves per second) First time through stage 4 is about 30 minutes and is where one gets rejuvenated
26 Stage 3
27 Stage 4
28 Sleep Play Sleep: Brain Functions (11:12) Module #14 from The Brain: Teaching Modules (2 nd edition).
29 Sleep Stages, REM, and Dreaming: REM Sleep
30 REM Sleep Stages 1-4 considered N-REM (non- REM sleep) Rapid eye movement (REM Sleep) as eyes move quickly back and forth Most dreaming occurs in REM sleep
31 REM Sleep
32 Paradoxical Sleep During REM sleep brain wave patterns are similar to when a person is awake Pulse and breathing quickens. REM sleep is sometimes called paradoxical sleep as one s physiology is close to that of being awake but the brainstem blocks all muscle movement
33 REM Sleep Play REM Sleep and Dreams (8:23) Module #15 from The Brain: Teaching Modules (2 nd edition).
34 Typical Night s Sleep
35 Stage 4/REM Changes
36 Sleep Changes through Life
37 Sleep Stages, REM, and Dreaming: Why Do We Dream?
38 Information-Processing Theory Dreams serve an important memoryrelated function by sorting and sifting through the day s experiences Research suggests REM sleep helps memory storage.
39 Physiological Function Theory Neural activity during REM sleep provides periodic stimulation of the brain.
40 Activation-Synthesis Theory Dreams are the mind s attempt to make sense of random neural firings in the brain as one sleeps.
41 Sleep Disorders and Sleep Problems: Insomnia
42 Insomnia Recurring problems falling asleep or staying asleep Sleeping pills tend to inhibit or suppress REM sleep; worsen the problem Alcohol suppresses REM sleep; also worsens the problem Studies show most people overestimate how long it took them to get to sleep
43 Sleep Disorders and Sleep Problems: Sleep Apnea
44 Sleep Apnea A sleep disorder characterized by temporary cessations of breathing during sleep and consequent momentary reawakenings. Tend to be loud snorers Continuous Positive Airway Pressure machine
45 Sleep Disorders and Sleep Problems: Narcolepsy
46 Narcolepsy A sleep disorder characterized by uncontrollable sleep attacks Person goes directly into REM sleep Nervous system getting aroused tends to trigger the sleep attack
47 Sleep Disorders and Sleep Problems: Other Sleep Problems
48 Somnambulism Formal name for sleepwalking Starts in the deep stages of N-REM sleep Person can walk or talk but remembers nothing of the experience
49 Night Terrors Sleep disorder characterized by high arousal and appearance of being terrified Happens during stage 4 sleep; mostly children The children seldom remember the event.
50 Other Sleep Disorders Bruxism teeth grinding Enuresis bed wetting Myoclonus sudden jerk of a body part occurring during stage 1 sleep Everyone has occasional episodes of myoclonus
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