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Impaired integration of object knowledge and visual input in a case of ventral simultanagnosia with bilateral damage to area V4

Leek, EC and d'Avossa, G and Tainturier, M-J and Roberts, DJ and Yuen, SL and Hu, M and Rafal, R (2012) Impaired integration of object knowledge and visual input in a case of ventral simultanagnosia with bilateral damage to area V4. COGNITIVE NEUROPSYCHOLOGY, 29 (7-8). pp. 569-583. ISSN 0264-3294

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Abstract

In this study we report some of the first evidence showing how brain-damage can affect the underlying processes that support the integration of sensory input and prior
knowledge during the visual perception of shape. We report the case of patient MT with an acquired ventral simultanagnosia following posterior occipito-temporal
lesions encompassing V4 bilaterally. Despite showing normal object recognition for single items, and intact low-level vision, MT was impaired in object identification
with overlapping figures displays. Task performance was modulated by familiarity: unlike controls, MT was faster with overlapping displays of abstract shapes than
common objects. His performance with overlapping common object displays was also influenced by both the semantic relatedness and visual similarity of the display items.
These findings challenge claims that visual perception is driven solely by feed forward mechanisms, and show how brain-damage can selectively impair high-level
perceptual processes supporting the integration of stored knowledge and visual sensory input.

Item Type: Article
Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Cognitive Neuropsychology in 2012, available online: http://dx.doi.org/10.1080/02643294.2012.752724
Uncontrolled Keywords: 1109 Neurosciences, 1701 Psychology, 1702 Cognitive Science
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions: Natural Sciences and Psychology
Publisher: PSYCHOLOGY PRESS
Related URLs:
Date Deposited: 27 Feb 2015 11:37
Last Modified: 27 Feb 2015 11:37
DOI or Identification number: 10.1080/02643294.2012.752724
URI: http://researchonline.ljmu.ac.uk/id/eprint/478

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