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Methods Inf Med 2007; 46(02): 160-163
DOI: 10.1055/s-0038-1625399
Original Article
Schattauer GmbH

Fast Feature Selection to Compare Broadband with Narrowband Phase Synchronization in Brain-computer Interfaces

E. Gysels
1   Swiss Center for Electronics and Microtechnology (CSEM), Neuchâtel, Switzerland
,
P. Renevey
1   Swiss Center for Electronics and Microtechnology (CSEM), Neuchâtel, Switzerland
,
P. Celka
2   Gold Coast Campus, Griffith University, School of Engineering, Gold Coast, Queensland, Australia
› Author Affiliations
Further Information

Publication History

Publication Date:
11 January 2018 (online)

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Summary

Objective : Brain-computer interface (BCI) research aims at developing communication devices for the motor disabled. Such devices are not driven by muscle activity, but by brain activity recorded during different mental tasks. We present here the comparison of phase synchronization and power spectral density (PSD) features, computed from broadband and narrowband filtered EEG signals and their ability to discriminate three mental tasks.

Methods : EEG signals were recorded from five subjects while performing left and right hand movement imagination and word generation. We applied a modified Fast Correlation Based Filter (FCBF) [9] for the purpose of feature selection.

Results : We found that the features were selected from electrode signals corresponding to neurophysiological evidence, i.e. electrodes lying over the motor cortex.

PSD and phase locking value (PLV) features were more discriminative when computed from narrowband (8-12 Hz) and broadband (8-30 Hz) filtered signals respectively.

Conclusions : The generalization performance is as good as the one obtained with SVM-rfe, but this algorithm is faster and selects fewer features. These properties may make FCBF a valuable tool for further improvement of BCIs.

Keywords

Brain-computer interface - broadband phase synchronization - EEG - Fast Correlation Based Filter
 

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