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  Regularised CSP for Sensor Selection in BCI

Farquhar, J., Hill, N., Lal, T., & Schölkopf, B. (2006). Regularised CSP for Sensor Selection in BCI. In G. Müller-Putz (Ed.), 3rd International Brain-Computer Interface Workshop and Training Course 2006 (pp. 14-15). Graz, Austria: Verlag der Technischen Universität Graz.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0013-D04F-9 Version Permalink: https://hdl.handle.net/21.11116/0000-0004-99D5-F
Genre: Conference Paper

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 Creators:
Farquhar, J1, 2, Author           
Hill, NJ1, 2, Author           
Lal, TN1, 2, Author           
Schölkopf, B1, 2, Author           
Affiliations:
1Department Empirical Inference, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497795              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: The Common Spatial Pattern (CSP) algorithm is a highly successful method for efficiently calculating spatial filters for brain signal classification. Spatial filtering can improve classification performance considerably, but demands that a large number of electrodes be mounted, which is inconvenient in day-to-day BCI usage. The CSP algorithm is also known for its tendency to overfit, i.e. to learn the noise in the training set rather than the signal. Both problems motivate an approach in which spatial filters are sparsified. We briefly sketch a reformulation of the problem which allows us to do this, using 1-norm regularisation. Focusing on the electrode selection issue, we present preliminary results on EEG data sets that suggest that effective spatial filters may be computed with as few as 10--20 electrodes, hence offering the potential to simplify the practical realisation of BCI systems significantly.

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 Dates: 2006-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 4245
 Degree: -

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Title: 3rd International Brain-Computer Interface Workshop and Training Course 2006
Place of Event: Graz, Austria
Start-/End Date: 2006-09-21 - 2006-09-24

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Title: 3rd International Brain-Computer Interface Workshop and Training Course 2006
Source Genre: Proceedings
 Creator(s):
Müller-Putz, GR, Editor
Affiliations:
-
Publ. Info: Graz, Austria : Verlag der Technischen Universität Graz
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 14 - 15 Identifier: ISBN: 3-902465-46-8