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Application of Tripolar Concentric Electrodes and Prefeature Selection Algorithm for Brain–Computer Interface

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3 Author(s)
Besio, W.G. ; Univ. of Rhode Island, Kingston ; Hongbao Cao ; Peng Zhou

For persons with severe disabilities, a brain-computer interface (BCI) may be a viable means of communication. Lapalacian electroencephalogram (EEG) has been shown to improve classification in EEG recognition. In this work, the effectiveness of signals from tripolar concentric electrodes and disc electrodes were compared for use as a BCI. Two sets of left/right hand motor imagery EEG signals were acquired. An autoregressive (AR) model was developed for feature extraction with a Mahalanobis distance based linear classifier for classification. An exhaust selection algorithm was employed to analyze three factors before feature extraction. The factors analyzed were 1) length of data in each trial to be used, 2) start position of data, and 3) the order of the AR model. The results showed that tripolar concentric electrodes generated significantly higher classification accuracy than disc electrodes.

Published in:

Neural Systems and Rehabilitation Engineering, IEEE Transactions on  (Volume:16 ,  Issue: 2 )

Date of Publication:

April 2008

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