title: Adaptation of motor imagery EEG classification model based on tensor decomposition.
abstract: OBJECTIVE
  Session-to-session nonstationarity is inherent in brain-computer interfaces based on electroencephalography. The objective of this paper is to quantify the mismatch between the training model and test data caused by nonstationarity and to adapt the model towards minimizing the mismatch.
  
  
  METHODS
  We employ a tensor model to estimate the mismatch in a semi-supervised manner, and the estimate is regularized in the discriminative objective function.
  
  
  RESULTS
  The performance of the proposed adaptation method was evaluated on a dataset recorded from 16 subjects performing motor imagery tasks on different days. The classification results validated the advantage of the proposed method in comparison with other regularization-based or spatial filter adaptation approaches. Experimental results also showed that there is a significant correlation between the quantified mismatch and the classification accuracy.
  
  
  CONCLUSIONS
  The proposed method approached the nonstationarity issue from the perspective of data-model mismatch, which is more direct than data variation measurement. The results also demonstrated that the proposed method is effective in enhancing the performance of the feature extraction model.
authors.affiliation: NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 119613, Singapore. Institute for Infocomm Research, Agency for Science, Technology and Research, Singapore 138632, Singapore.
authors.forename: Xinyang
authors.initials: X
authors.lastname: Li
authors.forename: Cuntai
authors.initials: C
authors.lastname: Guan
authors.forename: Haihong
authors.initials: H
authors.lastname: Zhang
authors.forename: Kai Keng
authors.initials: KK
authors.lastname: Ang
authors.forename: Sim Heng
authors.initials: SH
authors.lastname: Ong
mesh_terms: D000465:Algorithms; D001931:Brain Mapping / Q000379:methods*; D003198:Computer Simulation; D004562:Electrocardiography / Q000379:methods*; D019054:Evoked Potentials, Motor / Q000502:physiology*; D006801:Humans; D007092:Imagination / Q000502:physiology*; D008959:Models, Neurological; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity