Now you see it, now you don?t: surround suppression of bold is predictive of perceptual pop-out

Abstract

Event Abstract Back to Event Now you see it, now you don’t: surround suppression of bold is predictive of perceptual pop-out Branka Milivojevic1*, Mathijs Raemaekers2, Johan M. Jansma2, Nick Ramsey2, Margarita Calabrese3 and Chantal Kemner1 1 Utrecht University, Netherlands 2 UMC Utrecht, Netherlands 3 University of Amsterdam, Netherlands When an object differs markedly from its background environment it is more likely to capture attention. This perceptual pop-out effect has been attributed to surround suppression in V1. In human fMRI studies, surround suppression has been shown to result in lower BOLD signal, but the link with visual search performance has not been made so far. The aim of the current study is to establish this link. We compared BOLD amplitudes in response to circular textures consisting of either homogeneously (HT) or inhomogeneously (IhT) oriented gabor patches. We expected that HTs will elicit more suppression than IhTs. The results indicated that this is indeed the case with lower BOLD amplitudes in response to HTs than IhTs. Furthermore, the results indicate that surround suppression originates in V1, and the effects of surround suppression gets carried forward to higher-level visual areas. Outside the scanner, the participants also had to perform a target-detection task with similar stimuli. In this task, the targets had either SIMILAR, DIFFERENT, RANDOM or NO surround. Reaction times and accuracy to targets embedded in homogeneous, but DIFFERENT, surround and to targets presented in isolation (NONE) did not differ. In contrast, highly SIMILAR surround interfered with target detection to a similar degree as RANDOM surround. Behavioural results suggest that target pop-out facilitates visual search considerably more when the ratio between inhibition levels at target location and in the surround is large. Based on the idea that surround suppression arises in the V1, we designed stimuli that mimic the properties of population receptive fields in V1 and, as a control, V3. Both behavioural and fMRI effects were more pronounced for stimuli optimized for V1 response properties. Funding: Supported by NWO (Dutch scientific organisation) Vici grant to Prof. Chantal Kemner. Keywords: BOLD, Perception Conference: XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011. Presentation Type: Poster Presentation Topic: Poster Sessions: Neurophysiology of Sensation and Perception Citation: Milivojevic B, Raemaekers M, Jansma JM, Ramsey N, Calabrese M and Kemner C (2011). Now you see it, now you don’t: surround suppression of bold is predictive of perceptual pop-out. Conference Abstract: XI International Conference on Cognitive Neuroscience (ICON XI). doi: 10.3389/conf.fnhum.2011.207.00341 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: 23 Nov 2011; Published Online: 28 Nov 2011. * Correspondence: Dr. Branka Milivojevic, Utrecht University, Utrecht, Netherlands, b.milivojevic@donders.ru.nl 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 Branka Milivojevic Mathijs Raemaekers Johan M Jansma Nick Ramsey Margarita Calabrese Chantal Kemner Google Branka Milivojevic Mathijs Raemaekers Johan M Jansma Nick Ramsey Margarita Calabrese Chantal Kemner Google Scholar Branka Milivojevic Mathijs Raemaekers Johan M Jansma Nick Ramsey Margarita Calabrese Chantal Kemner PubMed Branka Milivojevic Mathijs Raemaekers Johan M Jansma Nick Ramsey Margarita Calabrese Chantal Kemner 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.