Figure 15.

Results for the obstacle avoidance task comparing device on (blue) versus device off (red). (A) Success rate (%) for verbally indicating object location on approach. (B) Walking speed for each trial, expressed as percent of preferred walking speed (PWS). (C) Collision rate (%) for each trial. (D) Percent of trials with zero collisions or contact. Circles show the average of 10 trials at each time point, shaded progressively darker for later dates and labelled with week number. The height of the bar is each subject's average across all time points. Statistical significance of within-subject comparisons is shown; *** P < 0.001; ** P < 0.01; NS = not significant.