Figure 3
From: Evaluation of EMG, force and joystick as control interfaces for active arm supports
Interface, target and cursor signals. Left) EMG (blue), force (green) and joystick (red) signals measured by the control interfaces. The interface signals, which are proportional to the velocity of the cursor, were generated by one of the participants attempting to track the target. Right) Target and cursor position signals for each control interface resulting from the interface signals shown in the left part of the figure.