Document Detail


How long is a piece of string? A study of line bisection in a case of visual neglect.
MedLine Citation:
PMID:  3416614     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We report a case of severe left visual neglect consequent upon extensive infarction in the territory of the right middle cerebral artery. A detailed analysis is given of the patient's performance on line bisection. The stimuli cover a wider range of lengths than is usually employed in such studies (11'' to 1''). The magnitude of the patient's rightward displacement of his transections is linearly related to the length of the stimulus line, such that the longer the line, the greater the left 'neglect'. At line length 2'', the patient's transections are relatively accurate, and at length 1'', the transections cross the objective midpoint to give a reliable left displacement (= 'right neglect'). On some occasions, these latter transections are placed beyond the leftmost point of the stimulus line. We interpret the data in terms of two constructs: (a) an 'attentional boundary' placed slightly to the left of the objective midline; (b) 'representational completion' that extends to the attentional boundary.
Authors:
P W Halligan; J C Marshall
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Publication Detail:
Type:  Case Reports; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Cortex; a journal devoted to the study of the nervous system and behavior     Volume:  24     ISSN:  0010-9452     ISO Abbreviation:  Cortex     Publication Date:  1988 Jun 
Date Detail:
Created Date:  1988-10-21     Completed Date:  1988-10-21     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0100725     Medline TA:  Cortex     Country:  ITALY    
Other Details:
Languages:  eng     Pagination:  321-8     Citation Subset:  IM    
Affiliation:
Rivermead Rehabilitation Centre, Oxford.
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MeSH Terms
Descriptor/Qualifier:
Adult
Brain Diseases / complications*,  radiography
Distance Perception*
Humans
Male
Middle Aged
Neuropsychological Tests*
Reference Values
Tomography, X-Ray Computed
Vision Disorders / psychology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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