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a) Probe placement: detectors in blue and sources in yellow. Numbers represent the channels. b) Example of motion artifacts present in the time-series of one participant. The blue line shows the 830 nm wavelength time-series, the red line the 690 nm wavelength time-series. The 690 nm time-series has been shifted by -0.3 for visualization purposes. Vertical lines indicate when the stimulus is presented to the participant. Note how the motion artifact is correlated to the task.
