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| Research article summary (published 30 Dec 2001): |
Widening the sphere of influence: using a tool to extend extrapersonal visual space in a patient with severe neglect.
Full Abstract
We report evidence that visual representations of space close to the body can be extended when a patient uses a tool to explore the environment. HB had severe neglect of left and far spatial regions which was determined more by how locations were visually perceived than by how they were represented tactilely or through proprioception. His ability to detect visual targets in left and far space was improved, however, when he held a tool. He also had limited tactile/proprioceptive knowledge about the location of his hand. These data suggest that by holding a tool, HB's more intact representation of near, visual space could be extended to include stimuli presented at a distance from his body. This extension of space improved his detection of visual stimuli. We discuss the implications of the results for the nature of our internal representation of space.
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Author information
Author/s: Ackroyd, Katie (K); Riddoch, M Jane (MJ); Humphreys, Glyn W (GW); Nightingale, Simon (S); Townsend, Stella (S);
Affiliation: Brain and Behavioural Sciences Centre, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK.
Journal and publication information
Publication Type: Case Reports; Journal Article; Research Support, Non-U.S. Gov't
Journal: Neurocase : case studies in neuropsychology, neuropsychiatry, and behavioural neurology (Neurocase), published in England. (Language: eng)
Reference: 2002-; vol 8 (issue 1-2) : pp 1-12
Dates: Created 2002/05/08; Completed 2002/07/03; Revised 2006/11/15;
PMID: 11997481, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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