Spatial gradient of P300 area of the brain visual evoked potential in the brain-computer interface paradigm

In 12 adult healthy subjects we studied Brain-Computer-Interface recognition of different intended letters by the square of P300 wave in the averaged VEP. Horizontal and vertical spatial gradient of this square was studied as well as tuning acuteness of visual attention to a significant letter. High...

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Bibliographic Details
Published inZurnal vyss̆ej nervnoj dejatelnosti imeni I P Pavlova Vol. 58; no. 3; p. 302
Main Authors Mikhaĭlova, E S, Chicherov, V A, Ptushenko, E A, Shevelev, I A
Format Journal Article
LanguageRussian
Published Russia (Federation) 01.05.2008
Subjects
Adolescent
Adult
Brain - physiology
Event-Related Potentials, P300 - physiology
Evoked Potentials, Visual - physiology
Female
Humans
Male
Pattern Recognition, Visual - physiology
User-Computer Interface
Online AccessGet more information
ISSN0044-4677

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Summary:In 12 adult healthy subjects we studied Brain-Computer-Interface recognition of different intended letters by the square of P300 wave in the averaged VEP. Horizontal and vertical spatial gradient of this square was studied as well as tuning acuteness of visual attention to a significant letter. High acuteness of this tuning was found (width of the tuning curve at its half height was equal to 1.6 grad) independent of the letter position on the letter matrix. Horizontal and vertical gradient of P300 were found to be very similar, but in the half of cases the first one revealed some kind of the "lateral inhibition": decrease of P300 square for the columns neighboring to the meaningful one. Tuning acuteness was found to be reliable and directly interrelated with P300 square. The data are discussed in relation to selectivity of the local visual attention.
ISSN:0044-4677