Classifying EEG for brain computer interfaces using Gaussian processes

Authors:
Mingjun Zhong;Fabien Lotte;Mark Girolami;Anatole Lécuyer
Affiliations:
IRISA, Campus de Beaulieu, F-35042 Rennes Cedex, France and Department of Applied Mathematics, Dalian Nationalities University, PR China;IRISA, Campus de Beaulieu, F-35042 Rennes Cedex, France;Department of Computing Science, University of Glasgow, Glasgow G12 8QQ, Scotland, UK;IRISA, Campus de Beaulieu, F-35042 Rennes Cedex, France
Venue:
Pattern Recognition Letters
Year:
2008

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Abstract

Classifying electroencephalography (EEG) signals is an important step for proceeding EEG-based brain computer interfaces (BCI). Currently, kernel based methods such as the support vector machine (SVM) are considered the state-of-the-art methods for this problem. In this paper, we apply Gaussian process (GP) classification to binary discrimination of motor imagery EEG data. Compared with the SVM, GP based methods naturally provide probability outputs for identifying a trusted prediction which can be used for post-processing in a BCI. Experimental results show that the classification methods based on a GP perform similarly to kernel logistic regression and probabilistic SVM in terms of predictive likelihood, but outperform SVM and K-nearest neighbor (KNN) in terms of 0-1 loss class prediction error.