title: ERPs evoked by different matrix sizes: implications for a brain computer interface (BCI) system.
abstract: A brain-computer interface (BCI) system may allow a user to communicate by selecting one of many options. These options may be presented in a matrix. Larger matrices allow a larger vocabulary, but require more time for each selection. In this study, subjects were asked to perform a target detection task using matrices appropriate for a BCI. The study sought to explore the relationship between matrix size and EEG measures, target detection accuracy, and user preferences. Results indicated that larger matrices evoked a larger P300 amplitude, and that matrix size did not significantly affect performance or preferences.
authors.affiliation: Department of Cognitive Science, University of California, San Diego, La Jolla, CA 92037, USA. ballison@cogsci.ucsd.edu
authors.forename: Brendan Z
authors.initials: BZ
authors.lastname: Allison
authors.forename: Jaime A
authors.initials: JA
authors.lastname: Pineda
mesh_terms: D000293:Adolescent; D000328:Adult; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods*; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005071:Evoked Potentials / Q000502:physiology; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D014584:User-Computer Interface; D014796:Visual Perception / Q000502:physiology*