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. 2022 Jan 14;12:784821. doi: 10.3389/fneur.2021.784821

Figure 1.

Figure 1

fNIRS optode arrangement and experimental protocol. (A) A photo obtained from a participant during the data acquisition. (B) A schematic of the fNIRS cap (22 sources: red circles, 30 detectors: blue circles) with 80 measurement channels (green line) covering the brain regions of frontal, temporal, parietal, and occipital lobes (C) The structural MRI image with the probe holder in which the gray dots represent the optode positions on the brain scalp, and the yellow dots represent the corresponding channel positions projected onto the brain surface using NIRS-SPM. The red area represented the typical regions activated during the language production task (i.e., the inferior frontal gyrus), and the blue area represented the typical regions activated during the spatial attention task (i.e., the inferior parietal sulcus and the superior parietal lobule). (D) Procedure of the picture-naming task. (E) Procedure of the landmark task. LP, language production (picture-naming task in this study); LM, landmark condition; LMC, landmark control condition; R, rest.