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Circadian rhythms.docx

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Psychology 1000

Circadian rhythms Daily cycles Blood pressure Body temperature Chemical concentrations 25- hour “clock “  Peak levels in late afternoon (best time for physical takes)  suprachiasmatic nucleus  internal timing mechanism in hypothalamus  Daylight stimulates the SCN, which inhibits production of melatonin in pineal gland  Darkness removes the inhibition, resulting in more melatonin. We feel tired Disturbances  jet lag and shift work  phase advance more difficult than phase delay, e.g, flying Vancouver to Halifax more problematic than east to west  take melatonin?  Jury still out o Seems safe o More effective for delay o Probably works by relieving daytime fatigue o Hydrate on plane o Avoid alcohol o Get up and stretch o Light meals o Expose self to sunlight upon arrival Consciousness  Awareness of the relationship between self and the external world  Monitoring – keeping track of self  Control- planning Preconsious level Info not currently available, but could be What does your parents house look like ? Tip of the tongue – I know it and then you dnt pulling out the brain Subconscious level  info not accessible, but … may “leak” out from time to time Freudian slips  unconscious leakage? Father son example undder the doctor example Freud(1908)  “a happy person never fantasizes, only an unhappy one” But… What do we fantasize about Top give day dreams we day dream about – 1. Failure or success 2. Aggression 3. Sex or romance 4. Guilt 5. Problem solving Why day dream ?  safety valve o ESCAPE FROM LIFE  ALTERS MOOD IN POSITIVE DIRECTION  Low risk way to deal with problems .. imagine reality  Increase arousal Tages of sleep During sleep, body begins to “shut down”  Heart rate lowered  Respiration lowered  Minimum of muscle activity  Temperature drops Marked decrease in sensitivity to external stimulation Eeg readings (how does a lucid dream work) Dreams Theories of sleep Sleep disorders Dream content Why do we sleep? What causes sleep disorders? What do we dream about? Why do we sleep ? a. restorative function sleep deprivation -> attention iapse … irritability but little effect on task performance b. evolutionary benefit webb (1975) c. learning and memory  REM deprived subjects show reduced ability to retain new information Note: REM Specific d. Mood adjustment Berry and webb (1985)  speed of cycling into REM correlated with positive mood on following day note: depressed individuals tend to cycle into REM very quickly … perhaps this helps impro
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