Recognition of motor imagery electroencephalography using independent component analysis and machine classifiers

Chih I. Hung, Po Lei Lee, Yu Te Wu, Li Fen Chen, Tzu Chen Yeh, Jen Chuen Hsieh

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Motor imagery electroencephalography (EEG), which embodies cortical potentials during mental simulation of left or right finger lifting tasks, can be used to provide neural input signals to activate a brain computer interface (BCI). The effectiveness of such an EEG-based BCI system relies on two indispensable components: distinguishable patterns of brain signals and accurate classifiers. This work aims to extract two reliable neural features, termed contralateral and ipsilateral rebound maps, by removing artifacts from motor imagery EEG based on independent component analysis (ICA), and to employ four classifiers to investigate the efficacy of rebound maps. Results demonstrate that, with the use of ICA, recognition rates for four classifiers (fisher linear discriminant (FLD), back-propagation neural network (BP-NN), radial-basis function neural network (RBF-NN), and support vector machine (SVM)) improved significantly, from 54%, 54%, 57% and 55% to 70.5%, 75.5%, 76.5% and 77.3%, respectively. In addition, the areas under the receiver operating characteristics (ROC) curve, which assess the quality of classification over a wide range of misclassification costs, also improved from .65, .60, .62, and . 64 to .74, .76, .80 and .81, respectively.

Original languageEnglish
Pages (from-to)1053-1070
Number of pages18
JournalAnnals of Biomedical Engineering
Volume33
Issue number8
DOIs
StatePublished - Nov 2005

Keywords

  • Back-propagation neural network (BP-NN)
  • Brain computer interface (BCI)
  • Fisher linear discriminant (FLD)
  • Radial-basis function neural network (RBF-NN)
  • Rebound maps
  • Support vector machine (SVM)

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