Channel Selection Improves MEG-based Brain-Computer Interface

Sujit Roy, Dheeraj Rathee, Karl McCreadie, Girijesh Prasad

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

13 Citations (Scopus)
232 Downloads (Pure)


This study investigates the effect of channel selection on the performance of a Magnetoencephalography (MEG)-based brain-computer interface (BCI) system in terms of classification accuracy (CA). Although many efforts are currently being undertaken to develop BCI using MEG, the major concern still is low accuracy. MEG systems involve data recording from a large number of channels which may provide a better spatio-temporal resolution for assessing brain patterns, however, a large numbers of channels result in a large number of features, which further make feature learning a challenging task. In this study, we evaluated the performance of two state-of-the-art channel selection methods, i.e. class-correlation (CC) and ReliefF (RF) across six binary classification tasks with a MEG dataset of 15 healthy participants. Both CC and RF methods provided a statistically significant increase in the CA (range: 20.91 - 24.22%) compared to baseline (i.e. using 204 channels) with bandpower features from the alpha (8-12 Hz) and beta frequency bands (13-30 Hz). Moreover, both methods reduce the optimum number of channels significantly (from 204 to the range of 1-22). Reducing the number of features can significantly reduce the computational cost and increase the chances of numerical stability which are key considerations in neurofeedback (online) applications.

Original languageEnglish
Title of host publication9th International IEEE EMBS Conference on Neural Engineering, NER 2019
Place of PublicationUnited States
Number of pages4
ISBN (Electronic)9781538679210
Publication statusPublished (in print/issue) - 20 May 2019
Event2019 9th International IEEE/EMBS Conference on Neural Engineering (NER) - San Francisco, CA, United States
Duration: 20 Mar 201823 Mar 2019

Publication series

NameInternational IEEE/EMBS Conference on Neural Engineering
ISSN (Print)1948-3546
ISSN (Electronic)1948-3554


Conference2019 9th International IEEE/EMBS Conference on Neural Engineering (NER)
Country/TerritoryUnited States
CitySan Francisco, CA
Internet address


  • Channel Selection
  • MEG
  • BCI
  • class-correlation (CC)
  • ReliefF (RF)


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