Brooks, JL, Gilaie-Dotan, S, Rees, G, Bentin, S and Driver, J (2012) Preserved local but disrupted contextual figure-ground influences in an individual with abnormal function of intermediate visual areas. Neuropsychologia, 50. 1393 - 1407. ISSN 0028-3932

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Visual perception depends not only on local stimulus features but also on their relationship to the surrounding stimulus context, as evident in both local and contextual influences on figure-ground segmentation. Intermediate visual areas may play a role in such contextual influences, as we tested here by examining LG, a rare case of developmental visual agnosia. LG has no evident abnormality of brain structure and functional neuroimaging showed relatively normal V1 function, but his intermediate visual areas (V2/V3) function abnormally. We found that contextual influences on figure-ground organization were selectively disrupted in LG, while local sources of figure-ground influences were preserved. Effects of object knowledge and familiarity on figure-ground organization were also significantly diminished. Our results suggest that the mechanisms mediating contextual and familiarity influences on figure-ground organization are dissociable from those mediating local influences on figure-ground assignment. The disruption of contextual processing in intermediate visual areas may play a role in the substantial object recognition difficulties experienced by LG.

Item Type: Article
Uncontrolled Keywords: Figure-ground organisation; Segmentation; Perceptual organisation; Context; Gestalt; Developmental visual agnosia; Grouping; Integration
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Natural Sciences > School of Psychology
Depositing User: Symplectic
Date Deposited: 30 Oct 2017 09:36
Last Modified: 03 Jun 2019 11:55

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