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Extrastriate cortex and medial temporal lobe regions respond differentially to visual feature overlap within preferred stimulus category

Mundy, Matthew Edward, Downing, P. E. and Graham, Kim Samantha 2012. Extrastriate cortex and medial temporal lobe regions respond differentially to visual feature overlap within preferred stimulus category. Neuropsychologia 50 (13) , pp. 3053-3061. 10.1016/j.neuropsychologia.2012.07.006

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Abstract

It has been proposed that domain-specific regions in extrastriate cortex, parahippocampal cortex and the medial temporal lobe (MTL, particularly the hippocampus, HC, and perirhinal cortex, PrC) may respond differently to the degree of feature complexity present in sets of visual stimuli, with the latter two regions tuned to represent the differences among stimuli with a high degree of visual overlap or featural ambiguity (Graham et al., 2010 and Cowell et al., 2010a). To test this prediction, healthy participants viewed blocks containing visually similar or visually different exemplars from four stimulus categories (scenes, faces, inanimate objects and animate objects). Independent functional regions of interest were identified in extrastriate and MTL regions that were preferentially responsive to one or more of these visual categories, and the main experimental data interrogated for any evidence of an interaction between visual category and degree of feature overlap. In PrC and posterior HC (PostHC) viewing sets of stimuli with a large number of overlapping features resulted in greater activity than blocks containing items that were more visually distinct. The opposite pattern was found in fusiform face area (FFA), parahippocampal place area (PPA) and lateral occipital complex (LOC). The increased response in the HC and PrC to high visual similarity was seen only for visual categories that effectively activate these regions (PrC—faces and objects; PostHC—scenes). This study confirms that regions throughout the visual ventral stream, parahippocampal cortex and MTL are engaged differentially by visual complexity, consistent with recent lesion experiments in which MTL damage affects discrimination and learning of, as well as recognition memory for, exemplars with a high degree of visual feature overlap.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Systems Immunity Research Institute (SIURI)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Memory; Perception; MTL; Extrastriate; Ambiguity; Discrimination learning
Publisher: Elsevier
ISSN: 0028-3932
Funders: BBSRC
Last Modified: 04 Jun 2017 06:19
URI: http://orca.cf.ac.uk/id/eprint/58405

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