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Clinical Trial
. 2000 Dec;8(4):441-6.
doi: 10.1109/86.895946.

Optimal spatial filtering of single trial EEG during imagined hand movement

H Ramoser  1 , J Müller-Gerking, G Pfurtscheller
Affiliations
Clinical Trial

Optimal spatial filtering of single trial EEG during imagined hand movement

H Ramoser et al. IEEE Trans Rehabil Eng. 2000 Dec.

Abstract

The development of an electroencephalograph (EEG)-based brain-computer interface (BCI) requires rapid and reliable discrimination of EEG patterns, e.g., associated with imaginary movement. One-sided hand movement imagination results in EEG changes located at contra- and ipsilateral central areas. We demonstrate that spatial filters for multichannel EEG effectively extract discriminatory information from two populations of single-trial EEG, recorded during left- and right-hand movement imagery. The best classification results for three subjects are 90.8%, 92.7%, and 99.7%. The spatial filters are estimated from a set of data by the method of common spatial patterns and reflect the specific activation of cortical areas. The method performs a weighting of the electrodes according to their importance for the classification task. The high recognition rates and computational simplicity make it a promising method for an EEG-based brain-computer interface.

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