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. 2021 Feb 5;15:588593. doi: 10.3389/fnins.2021.588593

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Copyright © 2021 Narita, Kamiya, Iwaki, Ishii, Endo, Shimosaka, Uchida, Kantake and Shibutani.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experimental aspects of finger and oral shape discrimination using prefrontal functional near-infrared spectroscopy (fNIRS). (A) Schematic diagrams and photographs of six types of test pieces: circle, ellipse, square, rectangle, triangle, and semicircle. (B) Positioning of the prefrontal fNIRS probes and corresponding channel numbers. (C) Timeline of a single session composed of six trials of shape discrimination in 8 min. (D) Location of the prefrontal fNIRS channels. Orange and red indicate the dorsolateral prefrontal cortex (DLPFC); yellow, the frontopolar area (FPA); green, triangular part of the inferior frontal gyrus (TP); blue, the orbitofrontal cortex (OFC); and purple, the inferior prefrontal gyrus (IFG). Each circle corresponds to a channel number. Pie chart shows percentage in cortical areas.