title: Visual gate for brain-computer interfaces.
abstract: Brain-Computer Interfaces (BCI) based on event related potentials (ERP) have been successfully developed for applications like virtual spellers and navigation systems. This study tests the use of visual stimuli unbalanced in the subject's field of view to simultaneously cue mental imagery tasks (left vs. right hand movement) and detect subject attention. The responses to unbalanced cues were compared with the responses to balanced cues in terms of classification accuracy. Subject specific ERP spatial filters were calculated for optimal group separation. The unbalanced cues appear to enhance early ERPs related to cue visuospatial processing that improved the classification accuracy (as low as 6%) of ERPs in response to left vs. right cues soon (150-200 ms) after the cue presentation. This work suggests that such visual interface may be of interest in BCI applications as a gate mechanism for attention estimation and validation of control decisions.
authors: Department of Industrial Electronics, University of Minho, Campus Azurem, 4800-058 Guimaraes, Portugal. ndias@dei.uminho.pt <ndias@dei.uminho.pt>
authors: N S
authors: NS
authors: Dias
authors: L R
authors: LR
authors: Jacinto
authors: P M
authors: PM
authors: Mendes
authors: J H
authors: JH
authors: Correia
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology*; D003463:Cues; D004569:Electroencephalography / Q000379:methods*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D007092:Imagination / Q000502:physiology; D008297:Male; D012680:Sensitivity and Specificity; D014584:User-Computer Interface; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult