Fig. 1.

Distribution of the source and detector locations for the task-related (a, created based on Refs. 22 and 23) and resting-state related data (b). Channels in green presented negative [${\mathrm{O}}_2\mathrm{Hb}$] to [HHb] correlation, the channels in red yielded a positive correlation, and the channel in yellow presented median correlation close to zero (within the range limited by $-0.1$ and 0.1). The correlation results shown in this figure correspond to group-level results, as described in Sec. 3.