Fig. 5.

Electrode selection. (A) A plot of the frequency of selecting each of the 16 electrodes for the Imagery classifier. This was determined by accounting for each time a feature belonging to a particular electrode was selected by the classifier. The more often an electrode was selected (# Times Selected) across a large proportion of the participants (Proportion of Participants is indicated by the colour bar), the more important the electrode was deemed. This was objectively determined using hierarchical clustering (B).