Figure 1
From: Electroencephalographic profiles for differentiation of disorders of consciousness
EEG profile of a sleep recording of control subject. (a), (b), (c) and (e) – numbers of waveforms conforming to the criteria defining, correspondingly, alpha, theta and beta waves and sleep spindles, detected per subsequent 3-min epochs. Each vertical line in (d) marks one occurrence of a K-complex. Lower panel (f) presents percentage of each 20-second epoch occupied by SWA; horizontal lines at 20% and 50% mark the classical criteria for stages 3 and 4 scoring.