Fig. 7.

Subject-averaged power changes (median across trials). The upper and lower rows show beta and gamma power changes, respectively. The left column shows contralateral grips and the right column ipsilateral grips. Onset of the visual cue is shown as the vertical dotted line at t = 0. To reduce noise, smoothing was applied by computing the average within a 1 s moving window for this visualization. Shaded regions denote standard error of the mean.