Fig. 2.

Example plots of motion data from Volunteer #2. The plots in panels A and B show the three translation and three rotation measurements from the optical camera (fast motion case). Panels C–E show the motion metrics calculated from the camera data for cases of no motion (C), slow motion (D), and fast motion (E, with data corresponding to plots in panels A and B). The grid lines indicate the timing of the MR volume acquisition. Note the different scale on the axes for panels C–E.