Interactive processes in viual perception: Evidence from neuropsychology

Abstract

Event Abstract Back to Event Interactive processes in viual perception: Evidence from neuropsychology Glyn Humphreys1* 1 Oxford University, Experimental Psychology, United Kingdom Lesions of extra-striate visual cortex are associated with a range of perceptual problems, including deficits in visual object recognition in which patients can be selectively impaired at responding either to the local or global properties of objects. Standard ‘subtraction’ accounts of neuropsychological cases suggest that such impairments reflect the simple loss of a visual process. Here I will present evidence from two contrasting patients, with complementary lesions of extra-striate cortex, which indicate that, rather than there being a simple loss of visual processing, there is a dynamic change in processing produced by the lesion. Neuropsychological fMRI demonstrates that, following impairments to local processing regions in ventral extra-striate cortex, there is an enhanced response to global shape in dorsal extra-striate cortex. Similarly, following damage to dorsal extra-striate cortex, there is an enhanced response to local shape. The data indicate the important role of interactions between visual areas in determining visual perception. Acknowledgements Stroke Association (UK) Keywords: local-global perception, fMRI, Agnosia, ventral visual cortex, dorsal visual cortex Conference: Belgian Brain Council, Liège, Belgium, 27 Oct - 27 Oct, 2012. Presentation Type: Oral Presentation (only for invited speakers) Topic: Higher Brain Functions in health and disease: cognition and memory Citation: Humphreys G (2012). Interactive processes in viual perception: Evidence from neuropsychology. Conference Abstract: Belgian Brain Council. doi: 10.3389/conf.fnhum.2012.210.00097 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: 03 Sep 2012; Published Online: 12 Sep 2012. * Correspondence: Prof. Glyn Humphreys, Oxford University, Experimental Psychology, Oxford, OX1 3UD, United Kingdom, glyn.humphreys@frontiersin.org 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 Glyn Humphreys Google Glyn Humphreys Google Scholar Glyn Humphreys PubMed Glyn Humphreys 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.