The wearable miniaturized NIRS System: (a) DAQ board and main board of the disassembled prototype, (b) aluminum enclosure of the main instrument with a size of 103 mm × 43 mm × 167 mm, (c) NIRS imager and control laptop stowed in a backpack, (d) dual 4-source/4-detector setup over left and right motor cortex as used for the bicycle experiment, and (e), position of NIRS measurement channels on the head surface, red: sources, blue: detectors, yellow: measurement positions.