Local-Global visual deficits in Williams Syndrome: Stimulus presence contributes to diminished performance on image-reproduction

Abreu, A. and French, R.M. and Cowell, R.A. and de Schonen, S. (2006) Local-Global visual deficits in Williams Syndrome: Stimulus presence contributes to diminished performance on image-reproduction. Psychologica Belgica, 46 (4). pp. 269-281. ISSN ISSN 0033-2879. (The full text of this publication is not available from this repository)

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http://www.cs.kent.ac.uk/pubs/2006/2851

Abstract

Impainnents in visuospatial processing exhibited by individuals with Williams Syndrome (WS) have been ascribed to a local processing bias. The imprecise specification of this local bias hypothesis has led to contradictions between different accounts of the visuospatial deficits in WS. We present two experiments investigating visual processing of geometric Navon stimuli by children with WS. The first experiment examined image reproduction in a visuoconstruction task and the second experiment explored the effect of manipulating global salience on recognition of visual stimuli by varying the density of local elements possessed by the stimuli. In the visuoconstruction task, the children with WS did show a local bias with respect to controls, but only when the target being copied was present; when drawing from memory, subjects with WS produced a heterogeneous pattern of answers. In the recognition task, children with WS exhibited the same sensitivity to global figures as matched controls, confinning previous findings in which no local bias in perception was found in WS subjects. We propose that subjects with WS are unable to disengage their attention from local elements during the planning stage of image reproduction (a visual-conflict hypothesis).

Item Type: Article
Subjects: Q Science > QA Mathematics (inc Computing science) > QA 76 Software, computer programming,
Divisions: Faculties > Science Technology and Medical Studies > School of Computing > Computational Intelligence Group
Depositing User: Mark Wheadon
Date Deposited: 29 Mar 2010 12:11
Last Modified: 29 Mar 2010 12:11
Resource URI: http://kar.kent.ac.uk/id/eprint/24045 (The current URI for this page, for reference purposes)
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