Tangent space features-based transfer learning classification model for two-class motor imagery brain-computer interface

Pramod Gaur, Karl McCreadie, R. B. Pachori, H. Wang, Girijesh Prasad

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The performance of a brain-computer interface (BCI) will generally improve by increasing the volume of training data on which it is trained. However, a classifier's generalization ability is often negatively affected when highly non-stationary data are collected across both sessions and subjects. The aim of this work is to reduce the long calibration time in BCI systems by proposing a transfer learning model which can be used for evaluating unseen single trials for a subject without the need for training session data. A method is proposed which combines a generalization of the previously proposed subject-specific "multivariate empirical-mode decomposition" preprocessing technique by taking a fixed band of 8-30Hz for all four motor imagery tasks and a novel classification model which exploits the structure of tangent space features drawn from the Riemannian geometry framework, that is shared among the training data of multiple sessions and subjects. Results demonstrate comparable performance improvement across multiple subjects without subject-specific calibration, when compared with other state-of-the-art techniques.

Original languageEnglish
Article number1950025
JournalInternational Journal of Neural Systems (IJNS)
Issue number10
Early online date12 Nov 2019
Publication statusPublished - 1 Dec 2019



  • Motor imagery
  • brain–computer interface (BCI)
  • tangent space
  • covariance matrix
  • multivariate empirical-mode decomposition (MEMD)
  • subject-specific multivariate empirical-mode decomposition-based filtering (SS-MEMDBF)
  • brain-computer interface (BCI)

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