NEUR 3303 Study Guide - Final Guide: Precuneus, 24Hours, Basal Ganglia
1 Mar 2018
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20% of body energy used by brain and <5% brain"s functional budget devoted to conscious stimulus-response changes 80% of brain"s enery used to support neural signaling. Typical cycle: n1:5%, n2: 50%, n3:20-25%, rem: 20-25% Eeg: fast waves, low voltage fast activity, alpha(8-13hz), occipital region. Neurons are depolarized and predisposed to firing. Nrem: metabolism and blood flow can be as down as 40% Eeg: much less alpha(8-13hz), much more theta(3-7hz), slower waves. N2 of nrem k complexes, sleep spindles(12-15hz), increase arousal thresh begins(harder to wake up/be aroused), reduced eye moves and muscle tone dopamine down, if interrupted, ppl will report they were sleeping. N3 of nrem-eeg: slow delta waves <2hz, >75mv, arousal thresh is higher, eye moves cease, muscles relaxed, deep sleep, ppl will be confused if woke. Rem-eeg: alpha/theta like wake or n1 stage, loss of muscle tone except extraocular muscles and diaphragm, bursts of rem and muscle twitches, arousal threshold as high as deep sleep, report dreams, depolarization level.
