Fig. 5

Representative muscle maps obtained by interpolation of muscle activity recorded using HD-EMG. Each grey circle indicates an electrode from the grid and the color shows the root mean square (RMS) of the EMG in μV, over a 250-ms data window (see color legend). a Maps generated from to the two matrices placed distally and proximally over the ventral side of the forearm (flexors). Data were recorded from a subject performing a sustained lateral grasp in the three wrist positions. b Maps corresponding to the two matrices placed over the dorsal and lateral side of the proximal forearm (extensors). Data recorded from the subject performing a sustained index pointing in the three wrist positions. Varying the position of the wrist produced different spatial distributions of muscle activity for the same hand gesture