Bayesian common spatial patterns for multi-subject EEG classification

Hyohyeong Kang

doi:10.1016/j.neunet.2014.05.012

Bayesian common spatial patterns for multi-subject EEG classification

2014-09-01

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DOI：10.1016/j.neunet.2014.05.012

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Multi-subject electroencephalography (EEG) classification involves algorithm development for automatically categorizing brain waves measured from multiple subjects who undergo the same mental task. Common spatial patterns (CSP) or its probabilistic counterpart, PCSP, is a popular discriminative feature extraction method for EEG classification. Models in CSP or PCSP are trained on a subject-by-subject basis so that inter-subject information is neglected. In the case of multi-subject EEG classification, however, it is desirable to capture inter-subject relatedness in learning a model. In this paper we present a non-parametric Bayesian model for a multi-subject extension of PCSP where subject relatedness is captured by assuming that spatial patterns across subjects share a latent subspace. Spatial patterns and the shared latent subspace are jointly learned by variational inference. We use an infinite latent feature model to automatically infer the dimension of the shared latent subspace, placing Indian Buffet process (IBP) priors on our model. Numerical experiments on BCI competition III IVa and IV 2a dataset demonstrate the high performance of our method, compared to PCSP and existing Bayesian multi-task CSP models. (C) 2014 Elsevier Ltd. All rights reserved.

Keywords:

Brain-computer interface

Common spatial patterns

EEG classification

Indian Buffet processes

Nonparametric Bayesian methods

Bayesian common spatial patterns for multi-subject EEG classification

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