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Electrode placement and EMG signals. (A) A 7 × 9 EMG electrode grid was placed over the skin of the forearm based on the anatomical landmarks of the forearm, and the absolute inter-electrode distance was not uniform. (B) The grid organization is presented in the relative forearm length and circumference dimensions. (C) The segments (150 ms) of EMG signals recorded from all electrodes during a four-finger extension task are shown.
