Fig. 6
From: A novel channel selection method for optimal classification in different motor imagery BCI paradigms
Averaged distributions of beta wave over three subjects in each paradigm. The beta wave (17–28 Hz) corresponds to the frequency band 10, 11, 12. The weight of each channel in the topographies is the average of channel weights from three representative subjects. a Averaged distribution for MI tasks paradigm; b averaged distribution for two-class control paradigm; c averaged distribution for four-class control paradigm