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Channel layouts. (a) For the test–retest experiment, 32 detectors and emitters were arranged in a 105 channel layout, represented by the blue circles. This layout covered the frontal, temporal, parietal, and occipital lobes. Black ovals surround 29 channels used for the ROI. (b) For the longitudinal experiment, 32 detectors and 29 emitters were arranged in a 98 channel layout. Black ovals surround 23 channels used for the ROI.
