Fig. 4

(Top) Absolute value of the target error during tuning with self-selected stance time visual feedback and increased stance time visual feedback and during steady-state. (Bottom) standard deviation of the target error. While tuning the prosthesis parameters, the users’ performance to hit the target and variability in hitting the target was not different from their steady-state performance. Pictures to the right depict the error and error variability. The horizontal line was the goal stance time and the red dot represents the averaged prosthesis side stance time. The arrows show the target error (top 2 plots) and error variability (bottom 2 plots)