The frequency spectrum of p300 components in left- and right-handers

Abstract

The study is dedicated to investigation of specific spectral features of ERP components. We suppose, that asymmetry type effects the charachteristics of ERP components. 14 left-handers and 15 right-handers took part in our research. ERPs were recorded according to standard P300 paradigm. The ICA-analysis was used to obtain separate ERP components. Anatomica location, frequency spectrum and component waveform were analysed in obtained dipoles. The components, which apparently took part in P300 generation were taken into account. It was shown, that both right-handers and left-handers hav three similar ICA-components, in right-handers additional ICA-component, located in right hemisphere insula, took part in generation of P300. One of the dipoles in temporal lobe was located significantly more sinistrally in left-handers, than in right-handers. The dipole, located in extrastriate cortical areas, was characterized by high absolute alpha-frequency power i both groups, higher in right-handers. The other dipoles, similar in both groups, had higher delta-frequency power in right-handers and higher theta-, alpha- and beta-frequency power in left-handers. Hence, the simple estimation of spectral characteristics of ERP is good enough in assistance of components distinguishing. Moreover, the frequency spectrum of ERP components is sensitive to human individual features, such as manual asymmetry.