Fig. 1
(a) Setup for data acquisition: the subject was seated comfortably in front of a graphical user interface (GUI) on the screen, performing different grasps or gestures as instructed by the GUI. In GRASP experiment (i), the right arm of the subject was supported by an arm holder. In GESTURE experiment (ii), the right arm of the subject was hanging naturally in no contact with the body. (b) Electrode grids placement on the subject’s right arm for recording HD-sEMG, same for both experiments. Each grid has 64 channels. The red figures indicate the grid number. For example, grid 1 corresponds to channel 1–64, and grid 5 corresponds to channel 257–320. (c), (d) The alignment of channels on grid 1, 2, and 3 (d) with 10 mm inter-electrode distance, and on grid 4 and 5 (e) with 8 mm inter-electrode distance.
