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Variations in Variations in ConsciousnessConsciousness
Chapter 5Chapter 5
Have you ever spaced out while Have you ever spaced out while driving because you were deeply driving because you were deeply engrossed in thought?engrossed in thought?
You suddenly snap out of it with no You suddenly snap out of it with no memory of the miles you’ve just memory of the miles you’ve just drivendriven
What keeps you on track of the What keeps you on track of the road and controls your responses road and controls your responses at the wheel???at the wheel???
States of consciousnessStates of consciousness
Normal waking statesNormal waking states Sleep/dreamsSleep/dreams Drug-induced experiencesDrug-induced experiences DaydreamsDaydreams HypnosisHypnosis UnconsciousnessUnconsciousness
What is What is consciousness???consciousness???
Moment-to-moment awareness of Moment-to-moment awareness of ourselves and our environmentourselves and our environment– Subjective and privateSubjective and private– Dynamic (ever changing)Dynamic (ever changing)– Self-reflective and central to our sense of selfSelf-reflective and central to our sense of self
Connected with process of selective Connected with process of selective attentionattention– e.g., mind is a “theatre”…consciousness e.g., mind is a “theatre”…consciousness
reflects what is “illuminated in the spot light”reflects what is “illuminated in the spot light”
Measuring states of Measuring states of consciousnessconsciousness
Self-reportsSelf-reports– People describe their inner People describe their inner
experiencesexperiences Physiological measuresPhysiological measures
– EEG recordings during stages of sleepEEG recordings during stages of sleep Behavioral measuresBehavioral measures
– Performance on special tasksPerformance on special tasks
Levels of consciousnessLevels of consciousness
William James-stream of consciousnessWilliam James-stream of consciousness Sigmund Freud-levels of awarenessSigmund Freud-levels of awareness
– ConsciousConscious– PreconsciousPreconscious– UnconsciousUnconscious
Cognitive unconsciousCognitive unconscious– Controlled vs. automatic processingControlled vs. automatic processing
Emotional unconsciousEmotional unconscious
Sleep IQ QuizSleep IQ Quiz
1.During sleep, your brain rests. 1.During sleep, your brain rests. 2.You cannot learn to function 2.You cannot learn to function
normally with one or two fewer normally with one or two fewer hours of sleep than you need. hours of sleep than you need.
3.Boredom makes you feel sleepy, 3.Boredom makes you feel sleepy, even if you have had enough even if you have had enough sleep.sleep.
Sleep IQ QuizSleep IQ Quiz 4. Resting in bed with your eyes 4. Resting in bed with your eyes
closed cannot satisfy your body’s closed cannot satisfy your body’s need for sleep. need for sleep.
5. Snoring is not harmful as long as 5. Snoring is not harmful as long as it doesn’t disturb others or wake it doesn’t disturb others or wake you up. you up.
6. Everyone dreams nightly. 6. Everyone dreams nightly. 7. The older you get, the less sleep 7. The older you get, the less sleep
you need.you need.
Sleep IQ QuizSleep IQ Quiz 8. Most people don’t know when they 8. Most people don’t know when they
are sleepy. are sleepy. 9. Cranking the radio while driving will 9. Cranking the radio while driving will
help you stay awake. help you stay awake. 10. Sleep disorders are mainly due to 10. Sleep disorders are mainly due to
worry or psychological problems. worry or psychological problems. 11. The human body never adjusts to 11. The human body never adjusts to
night shift work. night shift work. 12. Most sleep disorders go away 12. Most sleep disorders go away
without treatment.without treatment.
Sleep quiz answers Sleep quiz answers
1. F1. F 2. T2. T 3. F3. F 4. T4. T 5. F5. F 6. T6. T
7. F7. F 8. T8. T 9. F9. F 10. F10. F 11. T11. T 12. F12. F
Average = 5.5 points (1994)
Circadian Cycles: Biological Circadian Cycles: Biological ClockClock
Daily biological cycles are called Daily biological cycles are called circadian rhythmscircadian rhythms– Regulated by suprachiasmatic nuclei (SCN)Regulated by suprachiasmatic nuclei (SCN)– Regulates levels of melatonin (hormone that Regulates levels of melatonin (hormone that
relaxes body)relaxes body) What happens if you lived w/out clocks What happens if you lived w/out clocks
and can’t determine day from night??and can’t determine day from night??– Circadian rhythm runs longer than 24-hours Circadian rhythm runs longer than 24-hours
Environmental disruptions of circadian Environmental disruptions of circadian rhythmsrhythms– Jet lag (adjust faster when flying west)Jet lag (adjust faster when flying west)– Night-shift workNight-shift work– Seasonal affective disorder (SAD)Seasonal affective disorder (SAD)
Sleep and DreamingSleep and Dreaming
Spend 1/3 of life asleep…yet Spend 1/3 of life asleep…yet we don’t get nearly enough of we don’t get nearly enough of it!it!
We sleep less as we ageWe sleep less as we age Before invention of the light Before invention of the light
bulb, people slept around 10 bulb, people slept around 10 hours a nighthours a night– Today we average only 6.9 hours Today we average only 6.9 hours
during the weekduring the week
Stages of sleepStages of sleep
Every 90 minutes, we cycle Every 90 minutes, we cycle through different sleep stagesthrough different sleep stages
Measure brain activity during Measure brain activity during sleep with EEG recordingssleep with EEG recordings
Stage 1 through Stage 4Stage 1 through Stage 4 Stage 1 – light sleep, easily awakenedStage 1 – light sleep, easily awakened
– Transitional, lose responsiveness to stimuliTransitional, lose responsiveness to stimuli– 1-7 minutes1-7 minutes
Stage 2 - Sleep spindles (rapid brain activity) appearStage 2 - Sleep spindles (rapid brain activity) appear– Muscles more relaxed, dreams may occurMuscles more relaxed, dreams may occur– 10-25 minutes10-25 minutes
Stage 3-4 – appearance of very slow and large delta wavesStage 3-4 – appearance of very slow and large delta waves– Deepest sleepDeepest sleep– Heart rate, respiration, and body temperature decreaseHeart rate, respiration, and body temperature decrease– Voluntary muscles paralyzedVoluntary muscles paralyzed– 30 minutes30 minutes
Cycle of stages: 1-2-3-4-3-2Cycle of stages: 1-2-3-4-3-2 Pg. 134-135Pg. 134-135
Stage 5-REM sleepStage 5-REM sleep
– Characterized by rapid eye Characterized by rapid eye movements (REM), high arousal, and movements (REM), high arousal, and frequent dreamingfrequent dreaming 15-45 minutes 15-45 minutes REM sleep cycles become progressively REM sleep cycles become progressively
longer throughout the nightlonger throughout the night Brain activity, heart rate, blood pressure Brain activity, heart rate, blood pressure
resemble waking stateresemble waking state Age alters sleep cycles (p. 136)Age alters sleep cycles (p. 136)
Why do we sleep?Why do we sleep?
Restoration modelRestoration model– Sleep recharges our bodiesSleep recharges our bodies– High adenosine levels triggers sleepHigh adenosine levels triggers sleep
Evolutionary/circadian sleep modelsEvolutionary/circadian sleep models– Increase a species’ chance of survivalIncrease a species’ chance of survival
Memory consolidationMemory consolidation– Strengthening of neural circuits in Strengthening of neural circuits in
remembering important info that we remembering important info that we encountered during the dayencountered during the day
Sleep DeprivationSleep Deprivation Among American adults, 37% report they are Among American adults, 37% report they are
so sleepy that it interferes with their daily so sleepy that it interferes with their daily activitiesactivities
All types of sleep deprivation detrimentally All types of sleep deprivation detrimentally effect functioningeffect functioning– Lack of sleep can lead to Lack of sleep can lead to moodinessmoodiness, impulsivity, , impulsivity,
and depressionand depression Little effect on performance of tasks requiring Little effect on performance of tasks requiring
physical skill or intellectual judgmentphysical skill or intellectual judgment Hurts performance on simple, boring tasks Hurts performance on simple, boring tasks
more than challenging onesmore than challenging ones
Sleep Studies
Subjects were allowed to sleep 8 hours the first 3 nights, followed by 6 nights of 4 hours– @ the end of the study, researchers found symptoms
of sleep deprivation Mimicked signs of aging
– Their cells responded like those of 60 year olds Higher levels of cortisol (indicator of stress) Memory impairment Adverse health effects-more prone to infection and
circulatory diseases
Sleep DeprivationStudies on Rats
8 pairs of rats studied 5-33 days Sleep of experimental rats reduced
87%; whereas control animals slept only 31% less
Experimental rats stopped grooming and looked ill
Experimental rats died after 28 days, or were nearly dead and needed to be euthanized at the end of the study
What we know about sleep deprivation…
1. Undermines efficiency at work and school Lower grades (4o min. later/25 min. less more likely to
receive D’s than C’s) Lost productivity --- $18 billion/yr Health care --- $14 billion/yr Motor vehicle accidents ---$13 billion
2. It contributes to countless accidents– Getting less than 6 hours has been compared to
having the same effects as being drunk. 70,000 crashes per year 1,550 fatal crashes
3.Affects the body’s ability to metabolize glucose which leads to diabetes
4. 2005 study of 10,000 adults suggests that sleep deprivation leads to obesity.
5. Sleep deprivation leads to depression.
60% of patients showed immediate recovery when they got a good night’s sleep
6. Sleep is vital to good health!
DreamsDreams
When do we dream?When do we dream?– Most often during REM sleep Most often during REM sleep
(85% of the time)(85% of the time) What do we dream about?What do we dream about?
– Not nearly as strange as Not nearly as strange as stereotyped to bestereotyped to be
– Most are negativeMost are negative– Shaped by culture and Shaped by culture and
experiencesexperiences
But why do we dream???But why do we dream???
Drug-altered Drug-altered ConsciousnessConsciousness
ToleranceTolerance– Decreasing responsivity to a drugDecreasing responsivity to a drug– Faster a substance makes it to the brain, Faster a substance makes it to the brain,
the more quickly addicting it is…WHY???the more quickly addicting it is…WHY??? WithdrawalWithdrawal
– Occurrence of compensatory responses Occurrence of compensatory responses after discontinued drug useafter discontinued drug use
Conditioned drug responsesConditioned drug responses
Drug-altered Drug-altered ConsciousnessConsciousness
Substance dependenceSubstance dependence– Maladaptive pattern of Maladaptive pattern of
substance use that causes a substance use that causes a person significant distress or person significant distress or substantially impairs that substantially impairs that person’s lifeperson’s life
Mechanisms of Drug Mechanisms of Drug ActionAction
Psychoactive drugs alter Psychoactive drugs alter neurotransmitter activity in the neurotransmitter activity in the brainbrain
Many researchers believe that all Many researchers believe that all abused drugs increase activity in a abused drugs increase activity in a neural pathway called the neural pathway called the mesolimbic dopamine pathwaymesolimbic dopamine pathway
HypnosisHypnosis
HypnosisHypnosis
DemonstrationDemonstration
HypnosisHypnosis
A trancelike state in which A trancelike state in which susceptibility to suggestion is susceptibility to suggestion is heightenedheightened
Hypnotic susceptibilityHypnotic susceptibility
HypnosisHypnosis
Inducing hypnosis and making Inducing hypnosis and making suggestionssuggestions
clinical applications of hypnosisclinical applications of hypnosis– smoking cessation, pain smoking cessation, pain
management, phobia reductionmanagement, phobia reduction