Fig. 2

The effect of the number of electrodes on the accuracy. (1) is the effect of the number of electrodes on the accuracy. In (1), the x-axis is the number of electrodes, y is the Fisher distance, and 1.2 x represents the number of electrodes, where 0 is used only for the two electrodes on the forehead, y indicates the classification accuracy, and (2) shows the effect of the number of electrodes on the Fisher distance