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A, Channels with similar time-varying large decrease of beta-band power during the perimovement period. The channels, selected using a hierarchical cluster analysis, are shown in red on the map of the MEG 248-detector array for each subject (S1–S5). B, Cumulated clusters of channels across subjects. For each channel, the color code indicates the number of subjects that had that channel selected. All subjects had channels selected over the left sensorimotor region.
