Flashcards in sleep Deck (11):
stress elevates what neurotransmitter?
cortisol. prolonged elevation damages neurons in hippocampus, important for memory. danger from repeated adjustments to circadian rhythm.
influences circadian and circannual rhythms. produced by pineal gland to increase sleepiness.
suprachiasmatic nucleus. just above optic chiasm. part of the hypothalamus. generates circadian rhythms for sleep and temperature.
stages of sleep
1-4 + REM.
1 - theta waves. rolling eye movements.
2 - sleep spindles and k-complexes
3-4 are slow wave sleep.
rem = paradoxical sleep because deep and light.
cycles through every 90 minutes.
electroencephalograph. shows brain activity - electrical potentials of brain areas near each electrode on scalp.
Rises or falls when cells act in synchrony.
records eye movements
12-14 hz burst at least .5 seconds. results from oscillating interaction between thalamus and cortex cells. most prominent in stage 2.
sharp, high amplitude wave. sudden stimuli. most common in stage 2.
measures muscle tone
EOG measures eye movements