Topic6-Consciousness(students).ppt - Consciousness Dr Paul Wehr Agenda \u2022 Announcements \u2022 Consciousness \u2013 \u2013 \u2013 \u2013 In what way does

Topic6-Consciousness(students).ppt - Consciousness Dr Paul...

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Consciousness Dr. Paul Wehr
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Agenda Announcements: Consciousness: In what way does consciousness vary cyclically over time? Why do we sleep and what happens while we sleep? Why do we dream? How do Drugs have their effects on our nervous system?
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Introduction Variations in Consciousness: Quantitative Variations. Qualitative Variations. Alert Drowsy Sleep stream of Consciousness has depth Different quantities essence of Consciousness can change Different qualities
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Biological Rhythms Periodic cyclic phenomenon in living organisms. circadian Rhythm: every 24 hours. infradian Rhythm: monthly/annual. ultradian Rhythm: > once per day. Circadian Rhythm: Adaptations of organisms responding to changes in environment associated with earth’s rotation . Sleep/wake cycle.
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Biological Clock Suprachiasmatic Nucleus (SCN) in Hypothalamus. entrainment : internal events synchronized with external events (temperature & daylight). melatonin (involved in sleep) activity responds to illumination . Resets the clock. Messing with the “clock”. Sequestered with no time cues: 24.2 hour day Impose artificial 28 hour day?
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Rhythm of Sleep Ultradian Rhythm. Why sleep? Eliminate waste material from muscles . Repair cells. Reinforce immune system . Replenish biochemical compounds. Why not sleep MORE? Less energy. Reduced exposure to predators.
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Stages of Sleep Nathaniel Kleitman (1950s): studied sleep. Electroencephalograph (EEG): brain activity . Electromyograph (EMG): muscle contractions . Eletrooculograph (EOG): eye movement . NREM Sleep: light Sleep (stages 1 & 2): hypnic jerks (stage 1); respiration & heart rate slow; temperature decreases. deep Sleep (stage 3): slow-wave sleep. REM Sleep: Rapid movement of the eyes, increased heart rate, rise in blood pressure, quickened breathing, engorged penis/clitoris, limp skeletal muscles ( paralysis ). dreaming : long bursts of rapid, irregular brain activity. EEG Waves During Sleep
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Sleep Throughout the Night Stage 1 to stage 3; return to stage 1 for REM. Periods of REM sleep alternate with periods of non-REM sleep every 90 minutes (ultradian rhythm). Slow wave sleep decreases over the night. REM sleep increases over the night.
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Internal Desynchronization Occurs when “clock” is out of synch with environment: Jet lag; shift change. Sleep pattern adjust quickly; hormone levels and body temperature lag several days behind. Affects energy level, cognitive performance, motor coordination, irritable mood. Efficiency following shift change. Traffic accidents following daylight savings shift. Jet lag is worse moving eastward. chronic desynchronization can cause very mild brain damage.
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  • Fall '09
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