Fig. 2

Quality check of fNIRS data for a typical participant. (A) Time series of each channel. The first row displays the time courses of raw optical density data for all channels in each wavelength (i.e., 760 nm and 850 nm). The second row shows an image plot of the time courses of raw optical density (also referred to as greyplots). The third row shows the time courses of HbO and HbR. (B) Power spectral density at the channel level for HbO and HbR signals.