title: Novel protocols for P300-based brain-computer interfaces.
abstract: The oddball protocol is often used in brain-computer interfaces (BCIs) to induce P300 ERPs, although, recently, some issues have been shown to detrimentally effect its performance. In this paper, we study a new periodic protocol and explore whether it can compete with the standard oddball protocol within the context of a BCI mouse. We found that the new protocol consistently and significantly outperforms the standard oddball protocol in relation to information transfer rates (33 bits/min for the former and 22 bits/min for the latter, measured at 90% accuracy) as well as P300 amplitudes. Furthermore, we performed a comparison of two periodic protocols with two less conventional oddball-like protocols that reveals the importance of the interactions between task and sequence in determining the success of a protocol.
authors.affiliation: Brain-Computer Interfaces Lab, School of Computer Science and Electronic Engineering, University of Essex, CO4 3SQ Colchester, UK. mssalv@essex.ac.uk
authors.forename: Mathew
authors.initials: M
authors.lastname: Salvaris
authors.forename: Caterina
authors.initials: C
authors.lastname: Cinel
authors.forename: Luca
authors.initials: L
authors.lastname: Citi
authors.forename: Riccardo
authors.initials: R
authors.lastname: Poli
mesh_terms: D000328:Adult; D000465:Algorithms; D019540:Area Under Curve; D016477:Artifacts; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D003116:Color; D004192:Discrimination, Psychological / Q000502:physiology; D004569:Electroencephalography; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D006801:Humans; D010775:Photic Stimulation; D011597:Psychomotor Performance; D012372:ROC Curve; D012815:Signal Processing, Computer-Assisted; D012984:Software; D014584:User-Computer Interface