PSY 213 Lecture Notes - Lecture 5: Jet Lag, Suprachiasmatic Nucleus, Chronobiology

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Chapter 5
Topics: Biological rhythms
-moods
-long term rhythms
Sleep
Dreams
Altering consciousness
-hypnosis
-drugs
Consciousness: The awareness of oneself and the environment
Biological Rhythms
Regular fluctuations in a biological system
Periodic (daily, weekly, monthly, etc.)
May have psychological implications
Endogenous, generated from within
One type of biological rhythm: circadian rhythm
-once about every 24 hours
-ex. Sleep wake cycle, body temperature fluctuations
Circadian Rhythms
Sleep studies
-when times cues are removed, what do people do?
The biological clock
-controls circadian rhythms
-located in the hypothalamus
-suprachiasmatic nucleus
SCN
Regulates fluctuation levels of hormones and neurotransmitters
Ex. Melatonin, the sleep inducer
Internal desynchronization: when biological rhythms are not in phase with one another
-ex. Jet lag, irregular sleep schedule, illness, mealtimes
The Rhythms of Sleep
Alphas waves-small, rapid
Stage 1-small, irregular
Stage 2-sleep spindles
Stage 3-delta waves appear
Stage 4-mostly delta
REM-rapid, somewhat irregular
My Sleep Soapbox
Chronic sleeplessness
-increase cortisol
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