title: A four command BCI system based on the SSVEP protocol.
abstract: This paper discusses the development of a four command BCI system. This system is composed of a wearable electroencephalogram acquisition unit interfaced to a computer by a wireless Bluetooth (BT) connection. The implemented system relies on the steady-state visual evoked potential (SSVEP) protocol applied to a four selection system. In order to achieve the maximum reliability against false positives a five class classifier was used considering the idle state as an independent class. In order to maximize the usability of the system a two channel solution was tested and adopted. The BCI algorithm was based on a supervised multi-class classifier implemented by combining different binary regularized linear discriminant analysis (RLDA) classifiers. The biofeedback was evaluated by combining the resultant time signed distance with quality index related to the number of coherent identification obtained with the one-vs-all approach.
authors.affiliation: Bioengineering Department, Politecnico di Milano, Milan, Italy. luca.maggi@polimi.it
authors.forename: L
authors.initials: L
authors.lastname: Maggi
authors.forename: S
authors.initials: S
authors.lastname: Parini
authors.forename: L
authors.initials: L
authors.lastname: Piccini
authors.forename: G
authors.initials: G
authors.lastname: Panfili
authors.forename: G
authors.initials: G
authors.lastname: Andreoni
mesh_terms: D000328:Adult; D001185:Artificial Intelligence; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013647:Task Performance and Analysis; D014584:User-Computer Interface