Fig. 1

Schematic of the experimental design. (A) Experimental design. (B) fNIRS optode probe set. The fNIRS system consists of 21 light sources (shown in red) and 15 detectors (shown in blue), resulting in a total of 40 channels distributed over prefrontal, motor and occipital area in accordance with the international 10–20 system. (C) fNIRS measurement during robot-assisted overground gait training