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The fNIRS probes. (a) A demonstration of the placement of fNIRS probes on a subject’s forehead. The probes are shown reversed to illustrate the location of the light source and photodetectors. (b) A schematic of the fNIRS probe configuration. Photons travel from a light source to a photodetector through a banana-shape pathway with a penetration depth of half the source–detector distance. Measures are approximate. Reprinted with permission from Ref. 12.
