Fig. 1
From: A database of high-density surface electromyogram signals comprising 65 isometric hand gestures
Measurement setup. (a) The participant’s hand was positioned inside the force measurement device. Two 64 contacts electrodes were placed on dorsal and volar aspects of the upper forearm. Preamplifiers were placed at the electrode connector and amplified EMG signals were routed to Quattrocento device. HD-sEMG signals were displayed on a laptop screen in real-time while hand forces and cues were shown on a separate screen in front of the participant. (b) Hand positioned inside force measurement device taken from a different angle. (c) Pinout of ELSCH064NM3 electrode (skin top view). The differentiation of the EMG channels was done along the increasing channel indexes. For example, the first output (ch1) is calculated as the difference between EMG signals at contacts 2 and 1, ch8 as 9-8, and the last output (ch64) as the difference between the first of the next electrode and the last of the current electrode. (d) Position of flexion and extension electrodes in supinated and fully pronated forearm orientations.
