ppt_ch05_1 - Body Rhythms and Mental States Chapter 5 Body...

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Body Rhythms and Mental States Chapter 5
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Body Rhythms and Mental States Biological rhythms: The tides of experience The rhythms of sleep Exploring the dream world Consciousness-altering drugs The riddle of hypnosis
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Biological Rhythms: Tides of Experience Understanding biological rhythms. Endogenous biological rhythms. Circadian rhythms. When internal clocks are out of sync. Moods and long-term rhythms. Menstrual cycles and moods.
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Understanding Biological Rhythms Consciousness. Awareness of oneself and the environment. Biological rhythms. A periodic, more or less regular fluctuation in a biological system; may or may not have psychological implications. Entrainment. Biological rhythms are synchronized with external events such as changes in clock time, temperature, and daylight.
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Endogenous Biological Rhythms Circadian Rhythms Occur about every 24 hours. Example:The sleep-wake cycle. Infradian Rhythms Occur less often than once a day. Examples include birds migrating, bears hibernating. Ultradian Rhythms Occur more frequently than once a day, about every 90min. Examples include stomach contractions and hormone levels.
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Circadian Rhythms Occur in plants, animals, and people. To study endogenous circadian rhythms, scientists isolate volunteers from time cues. . Supraciasmatic nucleus (SCN). Located in the hypothalamus, responsible for circadian rhythms by regulating melatonin, a hormone secreted by the pineal gland.
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When Internal Clocks are Out of Sync Internal desynchronization A state when biological rhythms are not in phase with one another. Circadian rhythms are influenced by changes in routine. Examples include: Airplane flights across time zones. Adjusting to new work shifts. Also, illness, stress, fatigue, excitement, drugs, and mealtimes.
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Seasonal Affective Disorder (SAD). A controversial disorder in which person experiences depression during the winter and an improvement of mood in the spring. Treatment involves phototherapy or exposure
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This note was uploaded on 06/13/2011 for the course PSY 101 taught by Professor Erickahamilton during the Spring '11 term at Moraine Valley Community College.

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ppt_ch05_1 - Body Rhythms and Mental States Chapter 5 Body...

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