Fig. 1

Electrode placement and measures of oscillatory activity. A All analyses included 8 bilateral frontocentral electrodes. B Within-hemisphere and between-hemisphere pairs of electrodes are included in the analysis of phase synchronization. Green and orange colored lines connect each pair of electrodes within the left and right hemispheres, respectively and grey lines connect pairs of electrodes between hemispheres. C Schematic of change in power with button press for three trials overlaid (tr1, tr2, tr3). D Schematic of change in inter-electrode phase synchronization for three trials stacked vertically (tr1, tr2, tr3). In each trial, the oscillations at two electrodes are overlaid and indicated in red and blue (labeled el.1 and el.2). Across these trials, the phase difference between the two oscillatory signals is variable before button press and becomes more similar after the button press, indicating an increase in phase synchronization. E Schematic of change in phase locking for three trials overlaid (tr1, tr2, tr3)