Preserved local but disrupted contextual figure-ground influences in an individual with abnormal function of intermediate visual areas

Brooks, Joseph L and Gilaie-Dotan, Sharon and Rees, Geraint and Bentin, Shlomo and Driver, Jon (2012) Preserved local but disrupted contextual figure-ground influences in an individual with abnormal function of intermediate visual areas. Neuropsychologia, 50 (7). pp. 1393-1407. ISSN 0028-3932. (doi:https://doi.org/10.1016/j.neuropsychologia.2012.02.024) (Full text available)

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Abstract

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
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculties > Social Sciences > School of Psychology
Faculties > Social Sciences > School of Psychology > Cognitive Psychology
Depositing User: J. Brooks
Date Deposited: 26 Sep 2013 11:40 UTC
Last Modified: 13 Nov 2015 11:06 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/35325 (The current URI for this page, for reference purposes)
Brooks, Joseph L: https://orcid.org/0000-0002-5364-3611
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