title: Time-variant spatial filtering for motor imagery classification.
abstract: Effective spatial filtering plays a key role in motor imagery classification. This paper presents a novel approach to spatial filtering of EEG signal by modelling time-variant spatial patterns. This is in contrast to conventional Common Spatial Pattern which assumes static spatial patterns in a motor imagery trial. We define the model such that it accounts for relatively higher order dynamics in EEG. Furthermore, we formulate the training of the model as a dual optimization problem, and we derive an iterative optimization algorithm using quadratically constrained quadratic programming. Our experimental results on healthy subjects indicates that the proposed method is able to produce higher classification accuracy.
authors.affiliation: Institute for Infocomm Research, 21 Heng Mui Keng Terrace, Singapore 119613. hhzhang@i2r.a-star.edu.sg
authors.forename: Haihong
authors.initials: H
authors.lastname: Zhang
authors.forename: Chuanchu
authors.initials: C
authors.lastname: Wang
authors.forename: Cuntai
authors.initials: C
authors.lastname: Guan
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D003198:Computer Simulation; D003936:Diagnosis, Computer-Assisted / Q000379:methods; D004569:Electroencephalography / Q000379:methods*; D005071:Evoked Potentials / Q000502:physiology*; D019054:Evoked Potentials, Motor / Q000502:physiology*; D006801:Humans; D007092:Imagination / Q000502:physiology*; D008959:Models, Neurological; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted