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Transcript of 1 States of Consciousness Chapter 6. “The greatest discovery of my generation is that human beings...
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States ofConsciousness
Chapter 6
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“The greatest discovery of my generation is that human beings can alter their lives by altering their
attitudes of mind.” William James (1842-1910)
Marc Chagall (1887-1985) The Flying Carriage, 1913
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States of Consciousness
Waking Consciousness
Selective Attention
Levels of Information Processing
Sleep and Dreams
Biological Rhythms and Sleep
Why Do We Sleep?
Sleep Disorders
Dreams
Hypnosis Facts and Falsehoods Explaining the
Hypnotized State
Drugs and Consciousness Dependence and
Addiction Psychoactive Drugs Influences on Drug
Use
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Biological Rythms
A human body changes over the course of a day, a week, or a year.
Biological rhythmsA periodic, more or less regular fluctuation in a biological system; may or may not have psychological implications
ex: sleep/awake rhythms, body temperature; hibernating bears; stomach contractions; hormone fluctuations
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Biological Rhythms and SleepCircadian Rhythms occur on a 24-hour cycle and
include sleep and wakefulness. Termed our “biological clock,” it can be altered by artificial light.
Light triggers the suprachiasmatic nucleus to decrease(morning) melatonin from the pineal gland
and increase (evening) it at night fall.
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Measuring sleep: About every 90 minutes, we pass through a cycle of five distinct sleep stages.
Sleep Stages
Hank Morgan/ Rainbow
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Stages of Sleep
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Stage 1. Feel self drifting on the edge of consciousness
Stage 2. Minor noises won’t disturb you
Stage 3. Breathing and pulse have slowed down
Stage 4. Deep sleep
REM. Increased eye movement, loss of muscle tone, dreaming
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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 (9-14 cps). A
meditating person exhibits an alpha brain activity.
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During early, light sleep (stages 1-2) the brain enters a high-amplitude, slow,
regular wave form called theta waves (5-8 cps). A person who is daydreaming shows
theta activity.
Sleep Stages 1-2
Theta Waves
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During deepest sleep (stages 3-4), brain activity slows down. There are large-
amplitude, slow delta waves (1.5-4 cps).
Sleep Stages 3-4
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Stage 5: REM Sleep
After reaching the deepest sleep stage (4), the sleep cycle starts moving backward
towards stage 1. Although still asleep, the brain engages in low- amplitude, fast and regular beta waves (15-40 cps) much like
awake-aroused state.
A person during this sleep exhibitsRapid Eye Movements (REM)
and reports vivid dreams.
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Stages of Sleep
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The first 4 stage takes about 30-40 minutes, then you move back up.
Normal sleep cycle: 1, 2, 3, 4, 3, 2, 1, rapid eye movement (REM)
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90-Minute Cycles During Sleep
With each 90-minute cycle, stage 4 sleep decreases and the duration of REM sleep
increases.
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Typical night’s sleep for a young adult
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Why do we sleep?We spend one-third of
our lives sleeping.
•To eliminate waste products from muscles•To repair cells•To strengthen the immune system•To recover abilities lost during the day
Jose Luis Pelaez, Inc./ C
orbis
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Sleep Deprivation
1. Fatigue and subsequent death.
2. Impaired concentration.
3. Emotional irritability.
4. Depressed immune system.
5. Greater vulnerability.
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Accidents
Frequency of accidents increase with loss of sleep
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1. Insomnia: A persistent inability to fall asleep.
2. Narcolepsy: Overpowering urge to fall asleep that may occur while talking or standing up.
3. Sleep apnea: Failure to breathe when asleep.
Sleep Disorders
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Children are most prone to:
Night terrors: The sudden arousal from sleep with intense fear accompanied by physiological reactions (e.g., rapid heart rate, perspiration) which occur during Stage 4 sleep.
Sleepwalking: A Stage 4 disorder which is usually harmless and unrecalled the next day.
Sleeptalking: A condition that runs in families, like sleepwalking.
Sleep Disorders
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Dreams
The link between REM sleep and dreaming
has opened up a new era of dream research.
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REM Sleep
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• Also known as paradoxical sleep• Active brain waves• Increased heart rate and blood pressure,
limp muscles, twitching• Dreaming• REM and non-REM sleep cycle
throughout the night• The purpose of REM sleep is unclear
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What We Dream
1. Negative Emotional Content: 8 out of 10 dreams have negative emotional content.
2. Failure Dreams: People commonly dream about failure, being attacked, pursued, rejected, or struck with misfortune.
3. Sexual Dreams: Contrary to our thinking, sexual dreams are sparse. Sexual dreams in men are 1 in 10; and in women 1 in 30.
Manifest Content: A Freudian term meaning the story line of dreams.
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Why We Dream
1. Wish Fulfillment: Sigmund Freud suggested that dreams provide a psychic safety valve to discharge unacceptable feelings. The dream’s manifest (apparent) content may also have symbolic meanings (latent content) that signify our unacceptable feelings.
2. Information Processing: Dreams may help sift, sort, and fix a day’s experiences in our memories.
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Why We Dream
3. Physiological Function: Dreams provide the sleeping brain with periodic stimulation to develop and preserve neural pathways. Neural networks of newborns are quickly developing; therefore, they need more sleep.
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Why We Dream
4. Activation-Synthesis Theory: Suggests that the brain engages in a lot of random neural activity. Dreams make sense of this activity.
5. Cognitive Development: Some researchers argue that we dream as a part of brain maturation and cognitive development.
All dream researchers believe we need REM sleep. Whendeprived of REM sleep and then allowed to sleep,
we show increased REM sleep called REM Rebound.
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Dream TheoriesSummary
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Consciousness, modern psychologists believe, is an awareness of ourselves and our environment.
Forms of ConsciousnessB
ill L
ing/
Dig
ital
Vis
ion/
Get
ty I
mag
es
Chr
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rune
Stu
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lin/
Mag
num
Pho
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AP
Pho
to/ R
icar
do M
azal
an
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Selective Attention
Our conscious awareness processes only a small part of all that we
experience. We intuitively make use of the information we are not consciously
aware of.
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Inattentional Blindness
Inattentional blindness refers to the inability to see an object or a person in our midst.
Simons & Chabris (1999) showed that half of the observers failed to see the gorilla-suited
assistant in a ball passing game.
Dan
iel S
imon
s, U
nive
rsit
y of
Ill
inoi
s
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Change Blindness
Change blindness is a form of inattentional blindness in which two-thirds of individuals giving directions failed to notice a change in
the individual asking for directions.
© 1998 Psychonomic Society Inc. Image provided courtesy of Daniel J. Simmons.