Neuronal correlates of repetition priming of familiar and unfamiliar visual objects: evidence from fMRI and MEG

Abstract

Event Abstract Back to Event Neuronal correlates of repetition priming of familiar and unfamiliar visual objects: evidence from fMRI and MEG Uwe Friese1*, Benjamin Rahm2, Jochen Kaiser2 and Thomas Gruber1 1 University of Osnabrück, Germany 2 Gutenberg University, Germany Visual object recognition has been studied with various neuroimaging approaches including methods based on hemodynamic brain responses and electrophysiological measures. A common finding is the attenuation of brain activity during the processing of repeated stimuli in distributed cortical regions – a phenomenon often called repetition suppression. Due to differences in measuring modalities, experimental tasks, and procedures it is, however, difficult to compare previously published results directly. We conducted identical experiments with MEG and fMRI, respectively. Participants were repeatedly confronted with images of familiar and unfamiliar objects. Familiarity and repetition modulated fMRI-BOLD activity most prominently in bilateral occipito-temporal regions including the fusiform cortices. These regions have been associated with the processing of conceptual object representations in numerous fMRI studies. In the MEG study, we focused on the analysis of induced gamma band activity (iGBA) since synchronized oscillations in the gamma band range play an important role for the integration of distributed object representations. Source localization of iGBA revealed effects of familiarity and repetition in occipital and parietal cortex areas, partially overlapping with occipital regions found in the fMRI study. Both, the suppression of the BOLD signal and of iGBA are interpreted as a “sharpening” within cortical object representations which results in more efficient stimulus processing (i.e. priming). Our results demonstrate that while some overlap occurred for fMRI-BOLD and MEG-iGBA, each of the two methods might be sensitive to differential aspects of visual object processing. Keywords: fMRI, Memory Conference: XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011. Presentation Type: Poster Presentation Topic: Poster Sessions: Neural Bases of Memory and Learning Citation: Friese U, Rahm B, Kaiser J and Gruber T (2011). Neuronal correlates of repetition priming of familiar and unfamiliar visual objects: evidence from fMRI and MEG. Conference Abstract: XI International Conference on Cognitive Neuroscience (ICON XI). doi: 10.3389/conf.fnhum.2011.207.00421 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: 24 Nov 2011; Published Online: 28 Nov 2011. * Correspondence: Dr. Uwe Friese, University of Osnabrück, Osnabrück, Germany, ufriese@uos.de 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 Uwe Friese Benjamin Rahm Jochen Kaiser Thomas Gruber Google Uwe Friese Benjamin Rahm Jochen Kaiser Thomas Gruber Google Scholar Uwe Friese Benjamin Rahm Jochen Kaiser Thomas Gruber PubMed Uwe Friese Benjamin Rahm Jochen Kaiser Thomas Gruber 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.