title: Spatiotemporal source tuning filter bank for multiclass EEG based brain computer interfaces.
abstract: Non invasive brain-computer interfaces (BCI) allow people to communicate by modulating features of their electroencephalogram (EEG). Spatiotemporal filtering has a vital role in multi-class, EEG based BCI. In this study, we used a novel combination of principle component analysis, independent component analysis and dipole source localization to design a spatiotemporal multiple source tuning (SPAMSORT) filter bank, each channel of which was tuned to the activity of an underlying dipole source. Changes in the event-related spectral perturbation (ERSP) were measured and used to train a linear support vector machine to classify between four classes of motor imagery tasks (left hand, right hand, foot and tongue) for one subject. ERSP values were significantly (p<0.01) different across tasks and better (p<0.01) than conventional spatial filtering methods (large Laplacian and common average reference). Classification resulted in an average accuracy of 82.5%. This approach could lead to promising BCI applications such as control of a prosthesis with multiple degrees of freedom.
authors.affiliation: Dept. of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA. acharya@jhu.edu
authors.forename: Soumyadipta
authors.initials: S
authors.lastname: Acharya
authors.forename: Moshen
authors.initials: M
authors.lastname: Mollazadeh
authors.forename: Kartikeya
authors.initials: K
authors.lastname: Murari
authors.forename: Nitish
authors.initials: N
authors.lastname: Thakor
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D001931:Brain Mapping / Q000379:methods*; D004569:Electroencephalography / Q000379:methods*; D005071:Evoked Potentials / Q000502:physiology*; D006801:Humans; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D014584:User-Computer Interface