CHAPTER 9 SLEEP

CHAPTER 9 SLEEP - o Sleep o Circadian Cycle of approx. 24...

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o Sleep o Circadian Cycle of approx. 24 hours Other rhythms controlled by “ internal clocks” Zeitberger – stimulus (like light of dawn) that resets the biological clock responsible for circadian rhythms Bright light resets the internal clock – restart of advance it depdning on when light flash occurs Light occuras late at night, biological clock set ahead as if dawn already came Morning light, zeitberger resets clock Infraradian rhythms Period longer than a day Menstruation Ultraradian Repeat more than once a day Cravings, alertness, drowsiness, etc o Regulation of Sleep/Wake Cycle SCN (superchiasmatic nucleus) nucleius atop optic chiasm, contains biological clock responsible for organizing body’s circadian rhythem – FOR CIRCADIAN RHYTHM Melanopsin – photopigment transfer info to the SCN and thalamus. Pupils contstrict and dilate because of melanopsin SCN communicates with rest of brain chemically, or they think. SCN plays role in much longer rhythms than 24 hours
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This note was uploaded on 04/17/2008 for the course PSYC 326 taught by Professor Chambers,lavond during the Spring '05 term at USC.

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CHAPTER 9 SLEEP - o Sleep o Circadian Cycle of approx. 24...

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