Fig. 5
From: A novel channel selection method for optimal classification in different motor imagery BCI paradigms
The usage of each frequency band in the representative subjects. The height of each bar (y axis) quantitatively reflects how many channels reserved this frequency band as an informative feature. The numbers in x axis represent the frequency band serial number. The frequency range corresponding to each band no. is shown at the bottom of the figure. The subjects are the same with the ones in Fig. 4. a1, a2, a3 are the three subjects from MI tasks paradigm; b1, b2, b3 from two-class control paradigm; c1, c2, c3 from four-class control paradigm