title: Application of a hybrid wavelet feature selection method in the design of a self-paced brain interface system.
abstract: BACKGROUND
  Recently, successful applications of the discrete wavelet transform have been reported in brain interface (BI) systems with one or two EEG channels. For a multi-channel BI system, however, the high dimensionality of the generated wavelet features space poses a challenging problem.
  
  
  METHODS
  In this paper, a feature selection method that effectively reduces the dimensionality of the feature space of a multi-channel, self-paced BI system is proposed. The proposed method uses a two-stage feature selection scheme to select the most suitable movement-related potential features from the feature space. The first stage employs mutual information to filter out the least discriminant features, resulting in a reduced feature space. Then a genetic algorithm is applied to the reduced feature space to further reduce its dimensionality and select the best set of features.
  
  
  RESULTS
  An offline analysis of the EEG signals (18 bipolar EEG channels) of four able-bodied subjects showed that the proposed method acquires low false positive rates at a reasonably high true positive rate. The results also show that features selected from different channels varied considerably from one subject to another.
  
  
  CONCLUSIONS
  The proposed hybrid method effectively reduces the high dimensionality of the feature space. The variability in features among subjects indicates that a user-customized BI system needs to be developed for individual users.
authors.affiliation: Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. mehrdadf@ece.ubc.ca
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Fatourechi
authors.forename: Gary E
authors.initials: GE
authors.lastname: Birch
authors.forename: Rabab K
authors.initials: RK
authors.lastname: Ward
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019957:Motor Skills Disorders / Q000534:rehabilitation*; D012371:Robotics / Q000295:instrumentation*; D014584:User-Computer Interface