Fig. 5From: The challenge of controlling an auditory BCI in the case of severe motor disabilityBackward selection of relevant electrodes. A Horizontal axis, from left to right: at each step of the backward selection, an additional electrode is removed (the one that minimizes the loss in accuracy). Vertical axis: Accuracy. B Spatial locations of the most relevant 15 electrodes in green rectangle. Spatial location of the most relevant 7 electrodes in red rectangleBack to article page