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. 2021 Oct 19;21(20):6932. doi: 10.3390/s21206932

Figure 4.

Figure 4

The comparison of the two novel multichannel indices with the best and the worst channel for θ/α and (θ + α)/β single-channel indices for subject tr08-0111. The white part of the diagram represents an awake state, while the yellow part of the diagram represents stage 1 of sleep, i.e., a drowsiness state.