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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Designing optimal spatial filters for single-trial EEG classification in a movement task.

We devised spatial filters for multi-channel EEG that lead to signals which discriminate optimally between two conditions. We demonstrate the effectiveness of this method by classifying single-trial EEGs, recorded during preparation for movements of the left or right index finger or the right foot. The classification rates for 3 subjects were 94, 90 and 84%, respectively. The filters are estimated from a set of multichannel EEG data by the method of Common Spatial Patterns, and reflect the selective activation of cortical areas. By construction, we obtain an automatic weighting of electrodes according to their importance for the classification task. Computationally, this method is parallel by nature, and demands only the evaluation of scalar products. Therefore, it is well suited for on-line data processing. The recognition rates obtained with this relatively simple method are as good as, or higher than those obtained previously with other methods. The high recognition rates and the method's procedural and computational simplicity make it a particularly promising method for an EEG-based brain-computer interface.[1]


  1. Designing optimal spatial filters for single-trial EEG classification in a movement task. Müller-Gerking, J., Pfurtscheller, G., Flyvbjerg, H. Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology. (1999) [Pubmed]
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