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Flashcards in sleep Deck (11):
1

stress elevates what neurotransmitter?

cortisol. prolonged elevation damages neurons in hippocampus, important for memory. danger from repeated adjustments to circadian rhythm.

2

melatonin

influences circadian and circannual rhythms. produced by pineal gland to increase sleepiness.

3

SCN

suprachiasmatic nucleus. just above optic chiasm. part of the hypothalamus. generates circadian rhythms for sleep and temperature.

4

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.

5

EEG

electroencephalograph. shows brain activity - electrical potentials of brain areas near each electrode on scalp.
Rises or falls when cells act in synchrony.

6

polysomnograph

records eye movements

7

sleep spindles

12-14 hz burst at least .5 seconds. results from oscillating interaction between thalamus and cortex cells. most prominent in stage 2.

8

k-complex

sharp, high amplitude wave. sudden stimuli. most common in stage 2.

9

electromyogram

measures muscle tone

10

occulogram

EOG measures eye movements

11

hypnogogic hallucinations

dreamlike experience. hypnogogic jerk. happens in stage 1.