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. 2019 Aug 30;11:237. doi: 10.3389/fnagi.2019.00237

FIGURE 2.

FIGURE 2

Configuration of fNIRS optodes on the prefrontal cortex considering FpZ as a reference point in accordance with the international 10–20 system for EEG electrode placement. Blue circles and red hexagons represent detectors and emitters, respectively, and the numbers indicate fNIRS channels.