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. 2021 Jun 1;17(6):1237–1247. doi: 10.5664/jcsm.9174

Figure 2. Visual comparison of hypnograms and hypnodensity for the same polysomnographic recording.

Figure 2

(A) Manual hypnogram scored in Innsbruck. (B) Manual hypnogram scored in Berlin. (C) Hypnogram obtained by applying the automatic Stanford-STAGES algorithm. For each epoch, the sleep stage assigned was the one having the highest probability in the hypnodensity (D). Color codes for probabilities in the hypnodensity: white, W; red, N1; light blue, N2; dark blue, N3; black, REM. W = wakefulness, REM = rapid eye movement sleep, N1 = non-REM stage 1 sleep, N2 = non-REM stage 2 sleep, N3 = non-REM stage 3 sleep.