title: Event-related potentials in a moving matrix modification of the P300 brain-computer interface paradigm.
abstract: In the standard design of the brain-computer interfaces (BCI) based on the P300 component of the event-related potentials (ERP), target and non-target stimuli are presented at fixed positions in a motionless matrix. Can we let this matrix be moving (e.g., if attached to a robot) without loosing the efficiency of BCI? We assessed changes of the positive peak at Pz in the time interval 300-500 ms after the stimulus onset (P300) and the negative peak at the occipital electrodes in the range 140-240 ms (N1), both important for the operation of the P300 BCI, during fixating a target cell of a moving matrix in healthy participants (n=12). N1 amplitude in the difference (target-non-target) waveforms decreased with the velocity, although remained high (M=-4.3, SD=2.1) even at highest velocity (20°/s). In general, the amplitudes and latencies of these ERP components were remarkably stable in studied types of matrix movement and all velocities of horizontal movement (5, 10 and 20°/s) comparing to matrix in fixed position. These data suggest that, for the users controlling their gaze, the P300 BCI design can be extended to modifications requiring stimuli matrix motion.
authors.affiliation: Lomonosov Moscow State University, Faculty of Biology, Laboratory for Neurophysiology and Neuro-Computer Interfaces, 1/12 Leninskie Gory, Moscow 119991, Russia. sergshishkin@mail.ru
authors.forename: Sergei L
authors.initials: SL
authors.lastname: Shishkin
authors.forename: Ilya P
authors.initials: IP
authors.lastname: Ganin
authors.forename: Alexander Ya
authors.initials: AY
authors.lastname: Kaplan
mesh_terms: D000328:Adult; D000465:Algorithms; D001931:Brain Mapping / Q000379:methods*; D004569:Electroencephalography / Q000379:methods*; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods*; D011930:Reaction Time / Q000502:physiology; D012680:Sensitivity and Specificity; D014584:User-Computer Interface