Spatial characteristics of Dynamic random dot correlogram evoked visual potentials

Abstract

Event Abstract Back to Event Spatial characteristics of Dynamic random dot correlogram evoked visual potentials K. Markó1, H J. Kiss1, Barath E. Miko1, B. Torok2 and Gábor Jandó1* 1 Institute of Physiology Medical School of Pécs, University of Pécs, Hungary 2 Department of Ophthalmology Kantonsspital, Switzerland Our previous results showed that the amplitude of brain electrical potentials evoked by dynamic random dot correlogram (DRDC-VEPs) was independent of contrast. This is most probably due to the involvement of magnocellular visual pathway in the processing of binocular correlation. The objective of our present experiment was to study the DRDC-VEP as a function of pixel size at a high and low contrast conditions. Adults’ DRDC-VEPs and monocular yellow-black color checkerboard pattern reversals (PR-VEPs) were presented on red-green channels of a computer monitor and viewed through red-green goggles. Electrical scalp responses were recorded from Oz-Fz position. The Fourier component of the stimulus fundamental frequency and upper harmonics in EEG was analyzed by T2circ statistics. Latencies of PR-VEPs inceased with decreasing check size in both, the 70% and 10% contrast conditions. In agreement with the literature, the amplitude maximum was found at 15’ check size for the higher and 60’ for the lower contrasts, respectively. DRDC-VEP phases showed negative correlation with pixel size at both contrast levels. Amplitude maximum, however, could be found at the 3.75’ pixel size for the higher contrast and 7.5’ for the lower contrasts. The amplitude remained constant for the larger pixel sizes. We could not establish amplitude maximum for the 70% contrast, because the smallest pixel size used in this study resulted in the highest amplitude. There might be further increase in amplitude as the pixel size decreases. Shift in the DRDC-VEP phase is probably due to the elongation of neuronal processing time. Conference: 12th Meeting of the Hungarian Neuroscience Society, Budapest, Hungary, 22 Jan - 24 Jan, 2009. Presentation Type: Poster Presentation Topic: Research on the cerebral cortex and related structures Citation: Markó K, Kiss HJ, Miko BE, Torok B and Jandó G (2009). Spatial characteristics of Dynamic random dot correlogram evoked visual potentials. Front. Syst. Neurosci. Conference Abstract: 12th Meeting of the Hungarian Neuroscience Society. doi: 10.3389/conf.neuro.01.2009.04.211 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 06 Mar 2009; Published Online: 06 Mar 2009. * Correspondence: Gábor Jandó, Institute of Physiology Medical School of Pécs, University of Pécs, Pecs, Hungary, gabor.jando@aok.pte.hu Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers K. Markó H J Kiss Barath E Miko B. Torok Gábor Jandó Google K. Markó H J Kiss Barath E Miko B. Torok Gábor Jandó Google Scholar K. Markó H J Kiss Barath E Miko B. Torok Gábor Jandó PubMed K. Markó H J Kiss Barath E Miko B. Torok Gábor Jandó Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.