Spatial processing in Balint syndrome and prosopagnosia:A study of three patients

Barton, Jason J. S., Malcolm, George L. and Hefter, Rebecca L. (2007) Spatial processing in Balint syndrome and prosopagnosia:A study of three patients. Journal of Neuro-Ophthalmology, 27 (4). pp. 268-274. ISSN 1070-8022

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Abstract

Background: Spatial analysis may be subdivided into between-object and within-object spatial coding. We investigated the contribution of various visual cues to grouping processes that might determine whether single or multiple objects. were perceived and therefore which type of spatial coding would be used for a stimulus. Methods: We asked three patients to make shape judgments with a series of displays showing triangular arrangements, moving from more implicit triangles defined by separate objects at the apices (between-object spatial coding) to more explicit triangles with line edges or surface texture (within-object spatial coding). Results: In two patients with prosopagnosia, within-object spatial judgments were impaired;, whereas between-object spatial judgments were normal. In a patient with Balint syndrome, the reverse pattern was obtained. Surface texture but not'outline closure led to mandatory within-object coding in the prosopagnosic patients, where as outline or surface texture Wag sufficient to support intact within-object spatial judgments in the patient with Balint syndrome. Illusory contours were ineffective in promoting Within-object coding in either condition. Conclusions: These findings support the existence of parallel representations of space for within-object and between-object processing and reveal the efficacy of different cues in deter-mining which representation is potentially accessible.

Item Type: Article
Uncontrolled Keywords: illusory contours,objects,perception,space,representation,selection,parallel
Faculty \ School: Faculty of Social Sciences > School of Psychology
Depositing User: Pure Connector
Date Deposited: 04 Apr 2016 16:02
Last Modified: 22 Apr 2020 01:14
URI: https://ueaeprints.uea.ac.uk/id/eprint/58107
DOI: 10.1097/WNO.0b013e31815b9b85

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