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Regularised CSP for Sensor Selection in BCI

2006

Conference Paper

ei


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.

Author(s): Farquhar, J. and Hill, NJ. and Lal, TN. and Schölkopf, B.
Book Title: Proceedings of the 3rd International Brain-Computer Interface Workshop and Training Course 2006
Journal: Proceedings of the 3rd International Brain-Computer Interface Workshop and Training Course 2006
Pages: 14-15
Year: 2006
Month: September
Day: 0
Editors: GR M{\"u}ller-Putz and C Brunner and R Leeb and R Scherer and A Schl{\"o}gl and S Wriessnegger and G Pfurtscheller
Publisher: Verlag der Technischen Universit{\"a}t Graz

Department(s): Empirical Inference
Bibtex Type: Conference Paper (inproceedings)

Event Name: 3rd International Brain-Computer Interface Workshop and Training Course 2006
Event Place: Graz, Austria

Address: Graz, Austria
Digital: 0
Language: en
Organization: Max-Planck-Gesellschaft
School: Biologische Kybernetik

Links: PDF
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BibTex

@inproceedings{4245,
  title = {Regularised CSP for Sensor Selection in BCI},
  author = {Farquhar, J. and Hill, NJ. and Lal, TN. and Sch{\"o}lkopf, B.},
  journal = {Proceedings of the 3rd International Brain-Computer Interface Workshop and Training Course 2006},
  booktitle = {Proceedings of the 3rd International Brain-Computer Interface Workshop and Training Course 2006},
  pages = {14-15},
  editors = {GR M{\"u}ller-Putz and C Brunner and R Leeb and R Scherer and A Schl{\"o}gl and S Wriessnegger and G Pfurtscheller},
  publisher = {Verlag der Technischen Universit{\"a}t Graz},
  organization = {Max-Planck-Gesellschaft},
  school = {Biologische Kybernetik},
  address = {Graz, Austria},
  month = sep,
  year = {2006},
  month_numeric = {9}
}