From the methods described in Methods section and the derived results for both 10–10 and 10–5 extended positions for all brain parcellation methods considered and based on the two head atlases of reference, we developed, in Matlab2017a App Designer42, the toolbox “fNIRS Optodes’ Location Decider” (fOLD). The graphical user interface displayed upon software initialization is illustrated in Fig. 7.Figure 7Graphical user interface of the fNIRS Optodes’ Location Decider (fOLD). Depicted is the blank 10–10 layout as displayed upon toolbox initialization.