Fig. 9

The channels selected using SFS across all participants. The distribution of the matrices over the forearm is shown in the icon on the top-left corner. The top square represents the distal matrix, and the 3 bottom squares represent the three matrices placed around the proximal forearm. Colored circles are the selected channels. Each participant is represented by a different color and the participant number is indicated inside the circle. For channels selected for 2 participants, the circle is filled by the colors assigned to the respective participants. In case where more than 2 participants share the same channel, the participant numbers are indicated with an arrow (yellow circles). a Five channels selected across participants when the classifier was trained in the neutral wrist position. b Eight channels selected across participants when the classifier was trained using the data from all wrist positions combined