Blankertz, B., Dornhege, G., Krauledat, M., Schr"oder, M., Williamson, J., Murray-Smith, R. and Muller, K.R. (2006) The Berlin brain-computer interface presents the novel mental typewriter hex-o-spell. In: Proceedings of the 3rd International Brain-Computer Interface Workshop and Training Course, Graz, Austria, pp. 108-109.