Fig. 3

Results of group contrasts for design change task. Significant channels (q < 0.05) are shown as sold lines. Channels are displayed on top of the 10–20 coordinate system. For HbO contrasts, positive t-values (red) correspond to relatively larger activation for the first term of the contrast, and negative t-values (blue) correspond to larger activation for the second term. The opposite pattern applies to HbR contrasts. The t-statistic is scaled to [− 5, 5].