title: The synergy between complex channel-specific FIR filter and spatial filter for single-trial EEG classification.
abstract: The common spatial pattern analysis (CSP), a frequently utilized feature extraction method in brain-computer-interface applications, is believed to be time-invariant and sensitive to noises, mainly due to an inherent shortcoming of purely relying on spatial filtering. Therefore, temporal/spectral filtering which can be very effective to counteract the unfavorable influence of noises is usually used as a supplement. This work integrates the CSP spatial filters with complex channel-specific finite impulse response (FIR) filters in a natural and intuitive manner. Each hybrid spatial-FIR filter is of high-order, data-driven and is unique to its corresponding channel. They are derived by introducing multiple time delays and regularization into conventional CSP. The general framework of the method follows that of CSP but performs better, as proven in single-trial classification tasks like event-related potential detection and motor imagery.
authors.affiliation: Department of Mechanical Engineering, National University of Singapore, Singapore.
authors.forename: Ke
authors.initials: K
authors.lastname: Yu
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.forename: Kaiquan
authors.initials: K
authors.lastname: Shen
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Li
mesh_terms: D000465:Algorithms; D001921:Brain / Q000502:physiology*; D003463:Cues; D004569:Electroencephalography / Q000379:methods*; D005071:Evoked Potentials / Q000502:physiology*; D006801:Humans; D015203:Reproducibility of Results; D014584:User-Computer Interface; D014796:Visual Perception / Q000502:physiology