FIGURE 1.

Effects of head motion on HD‐DOT optode coupling. (a) Research participant wearing an HD‐DOT imaging cap. Head rotation may occur about three axes (roll, pitch, and yaw). (b) Schematic illustration of how head motion can affect optode couplings. The far‐left figure shows the ideal perpendicular angle between the source‐detector optodes and the head. The middle figure shows the angled optodes as a result of nodding up and back to the center. The far‐right figure shows the angled and shifted optodes as a result of nodding up and body movement