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. 2018 Aug 9;8:11941. doi: 10.1038/s41598-018-30416-7

Figure 1.

Figure 1

Simulation calculations of light propagation through head tissues of monkey head models (a) Spatial sensitivity profile (SSP) of a macaque monkey (Subject 1) in orthogonal optode alignment for source–detector distances, dSD, of 5, 10, 15, 20, and 25 mm. (b) Detected intensity, I, versus dSD. (c) Partial optical path length in the gray matter layer, Lgray versus dSD. (d) Regional Lgray at the hand knob versus dSD. Optode pairs aligned both parallel (Para) and orthogonal (Orth) to the central sulcus adjacent to the hand knob were examined. Subject 1 is the trained monkey to be measured with fNIRS.