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  • Research Article
  • Open Access

Robust EEG Channel Selection across Subjects for Brain-Computer Interfaces

  • 1Email author,
  • 2,
  • 3,
  • 1,
  • 2,
  • 3,
  • 1 and
  • 2
EURASIP Journal on Advances in Signal Processing20052005:174746

https://doi.org/10.1155/ASP.2005.3103

Received: 11 February 2004

Published: 17 November 2005

Abstract

Most EEG-based brain-computer interface (BCI) paradigms come along with specific electrode positions, for example, for a visual-based BCI, electrode positions close to the primary visual cortex are used. For new BCI paradigms it is usually not known where task relevant activity can be measured from the scalp. For individual subjects, Lal et al. in 2004 showed that recording positions can be found without the use of prior knowledge about the paradigm used. However it remains unclear to what extent their method of recursive channel elimination (RCE) can be generalized across subjects. In this paper we transfer channel rankings from a group of subjects to a new subject. For motor imagery tasks the results are promising, although cross-subject channel selection does not quite achieve the performance of channel selection on data of single subjects. Although the RCE method was not provided with prior knowledge about the mental task, channels that are well known to be important (from a physiological point of view) were consistently selected whereas task-irrelevant channels were reliably disregarded.

Keywords and phrases:

  • brain-computer interface
  • channel selection
  • feature selection
  • recursive channel elimination
  • support vector machine
  • electroencephalography

Authors’ Affiliations

(1)
Department of Computer Engineering, Eberhard-Karls University Tübingen, Tübingen, Germany
(2)
Max Planck Institute for Biological Cybernetics, Tübingen, Germany
(3)
Institute of Medical Psychology and Behavioral Neurobiology, Eberhard-Karls University Tübingen, Tübingen, Germany

Copyright

© Schröder et al. 2005

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