![]() ![]() ![]() ![]() Second, because EEG alone cannot distinguish REM/PS sleep from the awake state, it’s clear that recording the surface of the brain is not enough to define sleep. First, EEG only records signals from the neocortex, which covers and hides the rest of the brain, where the actual neuronal loci of sleep generators and regulators reside. This definition is so well-entrenched in the sleep research community that many of us have forgotten how deceptive and restrictive it can be. Using this electrophysiological working definition of sleep, researchers have made major progress in deciphering the mechanisms regulating sleep and wake states, and it is still the most precise method to quantify sleep in animals that possess a neocortex. ![]()
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