Fig. 8

Grand averages of HMD-CTT hand movement velocity profiles. HMD-CTT hand movement velocity (meters/second) profiles showing trajectories for young (a), middle-aged (b), and older adult (c) groups for Trails A (solid line) and Trails B (dashed lines) over time, scaled to reflect percent from trajectory completion duration. In a (YA), for each of Trails A and B, 840 trajectories were avaraged from 35 participants; in b (MA), 1176 trajectories were averaged from 49 participans; in c (OLD), 336 trajectories were averaged from 14 participants. See text for additional description and interpretation