An Optimized SWCSP Technique for Feature Extraction in EEG-based BCI System

Navtej S. Ghumman; Balkrishan Jindal

doi:10.14500/aro.10926

Navtej S. Ghumman Department of Computer Science and Engineering, Punjabi University Patiala, Punjab, India https://orcid.org/0000-0003-1056-542X
Balkrishan Jindal Department of Computer Engineering, YCoE, Punjabi University Guru Kashi Campus Talwandi Sabo, Punjab, India https://orcid.org/0000-0002-8026-4465

Keywords: Brain-computer interface, Common spatial pattern, Electroencephalogram, Feature extraction, Motor imagery

Abstract

Brain-computer interface (BCI) is an evolving technology having huge potential for rehabilitation of patients suffering from disorders of the nervous system, besides many other nonmedical applications. Multichannel electroencephalography (EEG) is widely used to provide input signals to a BCI system. Significant research in methodology employed to implement different stages of BCI system, has led to discovery of new issues and challenges. The raw EEG data includes artifacts from environmental and physiological sources, which is eliminated in preprocessing phase of BCI system. It is then followed by a feature extraction stage to isolate a few relevant features for further classification to a particular motor imagery (MI) activity. A feature extraction approach based on spectrally weighted common spatial pattern (SWCSP) is proposed in this paper to improve overall accuracy of a BCI system. The reported literature uses SWCSP for feature extraction, as it has outperformed other techniques. The proposed approach enhances its performance by optimizing its parameters. The independent component analysis (ICA) method is used for detection and removal of irrelevant data, while linear discriminant analysis (LDA) is used as a classifier. The proposed approach is executed on benchmark data-set 2a of BCI competition IV. It yielded classification accuracy of 70.6% across nine subjects, which is higher than all the reported approaches.

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Author Biographies

Navtej S. Ghumman, Department of Computer Science and Engineering, Punjabi University Patiala, Punjab, India

Navtej Singh is an Associate Professor at the Department of CSE, SBS State University, Ferozepur, Punjab, India. He got the B.Tech. degree in Computer Science and Engineering, the M.E. degree in Computer Science and Engineering and pursuing the Ph.D. degree in Computer Science and Engineering. His research interests are in Machine Learning, Signal Processing and Cloud Computing.

Balkrishan Jindal, Department of Computer Engineering, YCoE, Punjabi University Guru Kashi Campus Talwandi Sabo, Punjab, India

Balkrishan Jindal is an Associate Professor at the Department of CSE, YCoE, Punjabi University Guru Kashi Campus, Talwandi Sabo, Punjab, India. He got the B.Tech. degree in Computer Science and Engineering, the M.Tech. degree in Computer Sicience and Engineering and the Ph.D. degree in Computer Science and Engineering. Dr. Jindal is a member of Institution of Engineers, India. His research interests are in Image Processing, Data security, Steanography, and Signal Processing.

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