Guido Dornhege, Benjamin Blankertz, Matthias Krauledat, Florian Losch, Gabriel Curio, Klaus-Robert Müller
Brain-Computer Interface (BCI) systems create a novel communication channel from the brain to an output device by bypassing conventional motor output pathways of nerves and muscles. Therefore they could provide a new communication and control option for paralyzed patients. Modern BCI technology is essentially based on techniques for the clas- siﬁcation of single-trial brain signals. Here we present a novel technique that allows the simultaneous optimization of a spatial and a spectral ﬁlter enhancing discriminability of multi-channel EEG single-trials. The eval- uation of 60 experiments involving 22 different subjects demonstrates the superiority of the proposed algorithm. Apart from the enhanced clas- siﬁcation, the spatial and/or the spectral ﬁlter that are determined by the algorithm can also be used for further analysis of the data, e.g., for source localization of the respective brain rhythms.