table of contents chapter 5 variations in consciousness
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Chapter 5
Variations in Consciousness
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Consciousness: Personal Awareness
Awareness of Internal and External Stimuli…in other words our awareness of ourselves and our surroundings.
Levels of awareness• James – stream of consciousness• Freud – unconscious• Sleep/dreaming research
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The Electroencephalograph: A Physiological Index of Consciousness
EEG – monitoring of brain electrical activity
Brain-waves– Amplitude (height)– Frequency (cycles per second)
• Beta (13-24 cps)• Alpha (8-12 cps)• Theta (4-7 cps)• Delta (<4 cps)
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Correlation b/w brain waves and awareness
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Biological Rhythms and Sleep
Biological Rhythms: periodic fluctuations in physiological functioning- existence shows we have internal “biological clocks”
Circadian Rhythms – 24 hr biological cycles- Our body temperature and awareness changes throughout the day.
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Altering your sleep schedule
Jet lag- A disruption of circadian rhythms- Flying to California is easier
than flying to New York
Melatonin- A hormone produced by pineal gland at night to help you sleep. Sunlight tells your body to stop producing it.- Helps regulate circadian rhythms
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Sleep/Waking Research
Instruments:
– Electroencephalograph – brain electrical activity– Electromyograph – muscle activity – Electrooculograph – eye movements– Other bodily functions also observed
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Stage One
This is experienced as falling to sleep and is a transition stage between wake and sleep
It usually lasts between 1 and 7 minutes
eyes begin to roll slightly.
Hypnic jerks
consists mostly of theta waves
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Stage two
This follows Stage 1 sleep and is the "baseline" of sleep.
About 10 - 25 minutes
More mixed brain wave activity
Spindles: random bursts of higher frequency waves
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Stage three & four
Stages three is "Delta" sleep or "slow wave" sleep and may last 15-30 minutes.
It is called "slow wave" sleep because brain activity slows down dramatically from the "theta" rhythm to the “Delta”
It is delta sleep that a sleep-deprived person's brain craves the first and foremost.
In children, delta sleep can occupy up to 40% of all sleep time
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REM Sleep REM: Rapid Eye Movement
AKA “paradoxical sleep”
Composes 20-25 % of a normal nights sleep.
Breathing, heart rate and brain wave activity quicken.
Vivid Dreams can occur.
From REM, you go back to Stage 2
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In REM the body is essentially paralyzed during REM (sleep paralysis).
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The Neural Bases of Sleep
Brain Structures: - F 5.8– Ascending reticular activating system– Pons, medulla, thalamus, hypothalamus, limbic
system
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Sleep Deprivation
Complete deprivation– 3 or 4 days max– Maximum duration?
Partial deprivation or sleep restriction– impaired attention, reaction time, coordination, and
decision making
Selective deprivation– REM and slow-wave sleep: rebound effect – F 5.9
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REM deprivation effects
Figure 5.9
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Figure 5.10. Mortality rates as a function of typical sleep duration.
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Sleep Needs Averages:
- adults sleep 6 hrs and 54 minutes during the workweek – recommended 8 hrs- Younger adults (i.e., 18-29 year-olds) sleep 6 hours and 48 minutes during the week and an hour longer on the weekend - Adolescents need 9.25 hours of sleep – 20 % fall asleep in school- Younger children require 10 or more hours of sleep
“Power Nap” - 15 -20 minutes of duration
“Power Sleep” – strategies for better sleep
Takes about four weeks to stabilize sleep cycle
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Sleep Problems A majority of adults in the U.S. (62%) experienced a sleep
problem a few nights per week or more during the past year.
Insomnia – difficulty falling or staying asleep
Narcolepsy – falling asleep uncontrollably
Sleep Apnea – reflexive gasping for air that awakens – current estimates: 21 million in US and 470 million in the world
Nightmares – anxiety arousing dreams – REM
Night Terrors – intense arousal and panic – NREM
Somnambulism – sleepwalking
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XX 5.12
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Figure 5.13 – Sleep problems and the cycle of sleep
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Dreams and Dreaming: Content and Significance
Dreams – mental experiences during sleep– Content usually familiar– Common themes – Waking life spillover – day residue
Western vs. Non-Western interpretations
Freud – wish fulfillment – manifest content and latent content
Hobson & McCarley – activation – synthesis hypothesis
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Table of ContentsFigure 5.15 Three theories of dreaming
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Hypnosis: Altered State of Consciousness or Role Playing?
Hypnosis = a systematic procedure that increases suggestibility
Hypnotic susceptibility: individual differences – Stanford Hypnotic Susceptibility Scale
Hilgrad’s neural disassociation (hidden observer)and Barber’s role theory
Effects produced through hypnosis:– Anesthesia– Sensory distortions and hallucinations– Disinhibition– Posthypnotic suggestions and amnesia
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Figure 5.16 – Misconceptions regarding hypnosis
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Sensory Deprivation and Meditation
McGill University sensory deprivation study “Psychology of Boredom” – problems with participation and altered states
Meditation = practices that train attention to heighten awareness and bring mental processes under greater voluntary control
Yoga, Zen, transcendental meditation (TM)– Potential physiological benefits
• Similar to effective relaxation procedures
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Principal Abused Drugs and Their Effects
■ 6 categories of psychoactive drugs – Narcotics (opiates) – pain relieving - OxyContin– Sedatives – sleep inducing – effects GABA– Stimulants – increase CNS activity – effects on
dopamine – methamphetamine– Hallucinogens – distort sensory and perceptual
experience– Cannabis – produce mild, relaxed euphoria – Alcohol – produces relaxed euphoria, decreases in
inhibitions– MDMA – “Ecstacy” produces a warm, friendly euphoria –
problems of temperature regulation – effects serotonin
Brain reward pathways – dopamine and limbic system
Drug dependency and tolerance – physical and psychological
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Questions about Sleeping and Dreaming
Variations in length of sleep
Suggestions on improving quality of sleep
Anxiety and sleep difficulties – possible classical conditioning
Thinking and insomnia
Alcoholism a disease ?– Malfunctions as a result of alcoholism – Genetic basis– Learned behaviors– Problems with a definition of a “disease”
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Figure 5.26 - Physiological malfunctions associated with alcoholism