%0 Journal Article %J Clin Neurophysiol %D 2011 %T Toward a gaze-independent matrix speller brain-computer interface. %A Peter Brunner %A Gerwin Schalk %K Attention %K Brain %K Fixation, Ocular %K Humans %K User-Computer Interface %B Clin Neurophysiol %V 122 %P 1063-4 %8 06/2011 %G eng %U http://www.ncbi.nlm.nih.gov/pubmed/21183404 %N 6 %R 10.1016/j.clinph.2010.11.014