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States of vigilance. EOG, Electro-oculogram; EEG, cerebral activity from the left and right hemisphere respectively; EMG, Electromyogram. Note the electroencephalographic patterns during each state of vigilance. Certain ocular activity is present during W, it is absent in SWS and reappears during REM sleep. Muscular tonic activity is intense in W, reduces in SWS and is almost absent during REM sleep. Calibration: 5 sec, 50 µv.
