Fig. 2.
Posture matching experiment representative trial. Recorded EMG signals (in black—left Y axis) and actual position of the DoF in the robotic hand (in blue—right Y axis) for the four DoFs, in a representative posture (i.e., posture P3—a palmar grasp). Superimposed on the position trajectories is the desired target position (continuous horizontal line) within the ±15% envelope (dotted horizontal lines). Gray time window (the same for all four graphs) denotes when the four DoFs were positioned within the ±15% envelope; thus time metric Tc is by definition at the end of such a gray window.