Disassociation between gamma power and visual evoked potential revealed in human visual cortex

Abstract

Event Abstract Back to Event Disassociation between gamma power and visual evoked potential revealed in human visual cortex Eran Privman1* 1 Blavatnik School of Computer Science, Tel-Aviv University, Israel Recently scalp magnetoencephalography (MEG) studies revealed a rapid evoked response adaptation where one visual stimulus suppresses the evoked response (ERP) to the second stimulus. Here we investigated this effect using subdural intracranial recordings in humans. Our results show that the suppression of the ERP does not involve a reduction in neuronal activity - since gamma band responses remained unaffected. Rather, the ERP suppression was tightly related to the level of gamma activity preceding the event, and this effect was independent of the inter-stimulus interval. We propose that the ERP suppression is due to a desynchronization of neuronal firing resulting from recurrent neural activity in the vicinity of the freshly stimulated neurons and not an attenuation of the overall neural activity. This evoked potential suppression (EPS) effect can therefore serve as a robust marker for gamma-band activity even in non-invasive scalp EEG recordings. Due to its neuronal selectivity the EPS could provide a unique tool to study the tuning properties of human cortical neurons. Keywords: EEG, neural activity Conference: XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011. Presentation Type: Symposium: Oral Presentation Topic: Symposium 7: From single neuron responses to neuronal population oscillations during vision and memory: new insights from human intracranial recordings Citation: Privman E (2011). Disassociation between gamma power and visual evoked potential revealed in human visual cortex. Conference Abstract: XI International Conference on Cognitive Neuroscience (ICON XI). doi: 10.3389/conf.fnhum.2011.207.00043 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: 09 Nov 2011; Published Online: 15 Nov 2011. * Correspondence: Dr. Eran Privman, Blavatnik School of Computer Science, Tel-Aviv University, Tel-Aviv, Israel, eran.privman@gmail.com 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 Eran Privman Google Eran Privman Google Scholar Eran Privman PubMed Eran Privman 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.