A novel bayesian framework for discriminative feature extraction in brain-computer interfaces

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134 Citations (Scopus)

Abstract

As there has been a paradigm shift in the learning load from a human subject to a computer, machine learning has been considered as a useful tool for Brain-Computer Interfaces (BCIs). In this paper, we propose a novel Bayesian framework for discriminative feature extraction for motor imagery classification in an EEG-based BCI in which the class-discriminative frequency bands and the corresponding spatial filters are optimized by means of the probabilistic and information-theoretic approaches. In our framework, the problem of simultaneous spatiospectral filter optimization is formulated as the estimation of an unknown posterior probability density function (pdf) that represents the probability that a single-trial EEG of predefined mental tasks can be discriminated in a state. In order to estimate the posterior pdf, we propose a particle-based approximation method by extending a factored-sampling technique with a diffusion process. An information-theoretic observation model is also devised to measure discriminative power of features between classes. From the viewpoint of classifier design, the proposed method naturally allows us to construct a spectrally weighted label decision rule by linearly combining the outputs from multiple classifiers. We demonstrate the feasibility and effectiveness of the proposed method by analyzing the results and its success on three public databases.

Original languageEnglish
Article number6175024
Pages (from-to)286-299
Number of pages14
JournalIEEE Transactions on Pattern Analysis and Machine Intelligence
Volume35
Issue number2
DOIs
Publication statusPublished - 2013

Keywords

  • Brain-Computer Interface (BCI)
  • Discriminative feature extraction
  • ElectroEncephaloGraphy (EEG)
  • motor imagery classification
  • spatiospectral filter optimization

ASJC Scopus subject areas

  • Software
  • Computer Vision and Pattern Recognition
  • Computational Theory and Mathematics
  • Artificial Intelligence
  • Applied Mathematics

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