Research Article

Visual-Electrotactile Stimulation Feedback to Improve Immersive Brain-Computer Interface Based on Hand Motor Imagery

Figure 3

Grand average relative power (RP) in the -and central (C) -band, without considering the negative sign, in the channels FC3, FC4, C3, C4, CP3, and CP4 for the grasping MI task of both feedback groups (VIS: visual, VES: visual-electrotactile stimulation).