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Conditional random fields as classifiers for three-class motor-imagery brain–computer interfaces

Hasan, Bashar Awwad Shiekh and Gan, John Q (2011) 'Conditional random fields as classifiers for three-class motor-imagery brain–computer interfaces.' Journal of Neural Engineering, 8 (2). 025013-025013. ISSN 1741-2560

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Abstract

Conditional random fields (CRFs) are demonstrated to be a discriminative model able to exploit the temporal properties of EEG data obtained during synchronous three-class motor-imagery-based brain-computer interface experiments. The advantages of CRFs over the hidden Markov model (HMM) are both theoretical and practical. Theoretically, CRFs focus on modeling latent variables (labels) rather than both observation and latent variables. Furthermore, CRFs' loss function is convex, guaranteeing convergence to the global optimum. Practically, CRFs are much less prone to singularity problems. This property allows for the use of both time- and frequency-based features, such as band power. The HMM, on the other hand, requires temporal features such as autoregressive coefficients. A CRF-based classifier is tested on 13 subjects. Significant improvement is found when applying CRFs over HMM- and LDA-based classifiers. © 2011 IOP Publishing Ltd.

Item Type: Article
Uncontrolled Keywords: Motor Cortex; Humans; Electroencephalography; Brain Mapping; Data Interpretation, Statistical; Models, Statistical; Imagination; Evoked Potentials; Evoked Potentials, Motor; Algorithms; Models, Neurological; Computer Simulation; User-Computer Interface; Pattern Recognition, Automated; Effect Modifier, Epidemiologic
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science and Health
Faculty of Science and Health > Computer Science and Electronic Engineering, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 17 Oct 2012 11:34
Last Modified: 15 Jan 2022 00:23
URI: http://repository.essex.ac.uk/id/eprint/4075

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