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Title: Impaired integration of object knowledge and visual input in a case of ventral simultanagnosia with bilateral damage to area V4
Authors: Leek, EC
d'Avossa, G
Tainturier, MJ
Roberts, DJ
Yuen, SL
Hu, M
Rafal, R
Keywords: Ventral simultanagnosia;Perceptual integration;overlapping figures;V4
Issue Date: 2013
Citation: Cognitive Neuropsychology, 2013, 29 (7-8), pp. 569 - 583
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 feedforward mechanisms, and show how brain-damage can selectively impair high-level perceptual processes supporting the integration of stored knowledge and visual sensory input.
ISSN: 0264-3294
Appears in Collections:Dept of Life Sciences Research Papers

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