Fig. 4
From: A compact system for simultaneous stimulation and recording for closed-loop myoelectric control
Illustration of the grid used in the planar target reaching task where the horizontal and vertical axes corresponded to wrist rotation and hand aperture, respectively. The black cursor is located at the initial position, which indicates a neutral hand configuration, i.e. neutral wrist and hand fully opened. The cursor moved continuously in response to subject’s myoelectric commands while the grid cells indicated the ranges in each DoF that were mapped to the levels of discrete feedback (see text for details)