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Experimental setup of the fNIRS device. (A) The fNIRS device placed on a participant’s forehead. (B) A schematic diagram of 1.5 cm- and 3 cm-channels in the fNIRS device. (C) 1.5 cm- and 3 cm-channel configurations of the fNIRS device. Each grid size is 15×15 mm. The sources and detectors that overlap with the channel-number notation are not presented.
