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Stage 4 is the most synchronous stage high amplitude

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Unformatted text preview: energy Cyclic decreased motor action and perception Can still shift, awake by touch Theories on purpose of sleep Let body rest Lets brain rest; but some regions are more active Enhances memory (dreaming) Enhances learning (dreaming) Promotes adequate immune system function Mechanisms of sleep are poorly understood. Study of sleep: EEG 2 kinds of sleep Slow- wave sleep (SWS) REM sleepp 2 states dream nightmare (REM, PTSD) Sleep- Wake cycles and the Ascending Reticular activating System (ARAS) ARAS: awakens the cortex Part of reticular formation Projections to the thalamus, hypothalamus, forebrain Forebrain: induces the slow- wake sleep NTs in sleep state SWS induced by the forebrain Adenosine (not ATP): blocked by caffeine REM sleep induced in pons Acetylcholine NTs in the awake state, in ARAS Acetylcholine: mimicked by nicotine, fast- gated Norepinephrine/dopamine: mimicked by amphetamines The stage 4 decrease in magnitude, frequency. REM sleep increases in magnitude. Progressive arousal. Beta waves are a set of small choppy waves 13- 20 cycles per second. Alpha waves are large in amplitude and less frequent (8- 12 Hz)...
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