Chapter 5. Variations in Consciousness 8 th Edition
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1 Chapter 5 Variations in Consciousness 8 th Edition
2 Consciousness: Personal Awareness Awareness of Internal and External Stimuli Levels of awareness James stream of consciousness Freud unconscious Sleep/dreaming research
3 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) Mental state and cortical activity correlation issue F 5.1
4
5 Biological Rhythms and Sleep Circadian Rhythms 24 hr biological cycles Regulation of sleep/other body functions F 5.2 Physiological pathway of the biological clock: Light levels -> retina -> suprachiasmatic nucleus of hypothalamus -> pineal gland -> secretion of melatonin Melatonin and circadian rhythms Performance effects Recht et al. (1995) study of professional baseball F 5.3
6 Sleep/Waking Research Instruments: Electroencephalograph brain electrical activity Electromyograph muscle activity Electrooculograph eye movements Other bodily functions also observed
7 Sleep Stages: Cycling Through Sleep Stage 1: brief, transitional (1-7 minutes) see F 5.4 alpha -> theta hypnic jerks Stage 2: sleep spindles (10-25 minutes) Stages 3 & 4 : slow-wave sleep (30 minutes) Stage 5: REM, EEG similar to awake, vivid dreaming (initially a few minutes, progressively longer as cycle through the stages) Developmental differences in REM sleep F 5.6 How quickly one falls asleep, how long one sleeps, how one cycles through the various stages F 5.5 Varies from one person to the next cultural differences F 5.7 Each of us has a signature sleep pattern mostly shaped by biological factors rather than personal habits
8 Figure 5.5 An overview of the cycle of sleep
9 Figure 5.5 An overview of the cycle of sleep
10 The Neural Bases of Sleep Brain Structures: - F 5.8 Ascending reticular activating system Pons, medulla, thalamus, hypothalamus, limbic system Neurotransmitters: Acetylcholine and serotonin Also norepinephrine, dopamine, and GABA
11 XX 5.8
12 Why Do We Sleep? Hypothesis 1: Sleep evolved to conserve organisms energy Hypothesis 2: Immobilization during sleep is adaptive because it reduces danger Hypothesis 3: Sleep helps animals to restore energy and other bodily resources
13 Sleep Deprivation Complete deprivation 3 or 4 days max Maximum duration? Partial deprivation or sleep restriction impaired attention, reaction time, coordination, and decision making accidents: Chernobyl, Exxon Valdez, bus crashes, airline crashes Selective deprivation REM and slow-wave sleep: rebound effect F 5.9
14 REM deprivation effects Figure 5.9
15 Sleep Loss and Health Sleep loss can affect physiological processes Sleep restriction appears to trigger hormonal changes that increase hunger Studies have found a link between short sleep duration and increased obesity Mortality rates are especially high among those who consistently sleep over 10 hours F 5.10
16 Figure Mortality rates as a function of typical sleep duration.
17 Sleep Deprivation effects 43 % of adults are chronically sleep deprived Mood shifts, decreased socialization & sense of humor Decreased motor and cognitive performance Reduced ability to concentrate and decision skills Reduced ability to handle complex tasks Increased risk taking behavior and accidents (driving) Decreased efficiency of immune system Decreased functioning of frontal lobes Increased microsleeps and daytime sleepiness (43%)
18 Sleep Needs On average, adults sleep 6 hours and 54 minutes during the workweek recommended 8 hours Younger adults (i.e., year-olds) sleep an average of 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 minutes of duration Power Sleep strategies for better sleep Takes about four weeks to stabilize sleep cycle
19 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. (Sleep Ominbus Survey 2000) Insomnia difficulty falling or staying asleep - (58%) F 5.11, F 5.12 Narcolepsy falling asleep uncontrollably Sleep Apnea reflexive gasping for air that awakens - (10%) 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
20 XX 5.12
21 Figure 5.13 Sleep problems and the cycle of sleep
22 Dreams and Dreaming: Content and Significance Dreams mental experiences during sleep Content usually familiar Common themes F 5.14 Waking life spillover day residue Western vs. Non-Western interpretations Freud wish fulfillment manifest content and latent content F 5.15 Hobson & McCarley activation synthesis hypothesis F 5.15
23 Figure 5.15 Three theories of dreaming
24 Hypnosis: Altered State of Consciousness or Role Playing? Hypnosis = a systematic procedure that increases suggestibility Hypnotic susceptibility: individual differences F 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
25 Figure 5.16 Misconceptions regarding hypnosis
26 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 F 5.18 Yoga, Zen, transcendental meditation (TM) Potential physiological benefits Similar to effective relaxation procedures
27 Principal Abused Drugs and Their Effects 6 categories of psychoactive drugs Table 5.2 Narcotics (opiates) pain relieving - OxyContin Sedatives sleep inducing effects GABA Stimulants increase CNS activity effects on dopamine F 5.19, methamphetamine Hallucinogens distort sensory and perceptual experience Cannabis produce mild, relaxed euphoria F 5.21 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 Figure 5.20 Drug dependency and tolerance physical and psychological Table 5.3
28
29
30 Figure 5.19 Stimulant drugs and neurotransmitter activity Figure 5.20 The reward pathways in the brain
31 Questions about Sleeping and Dreaming Variations in length of sleep F 5.22 Suggestions on improving quality of sleep F 5.23 Anxiety and sleep difficulties F 5.24 possible classical conditioning Thinking and insomnia F 5.25 Alcoholism a disease? Malfunctions as a result of acoholism F 5.26 Genetic basis Learned behaviors Problems with a definition of a disease
32 Figure Physiological malfunctions associated with alcoholism
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