Document Detail

Direction and position factors in performance of line extension task by unilateral neglect subjects.
MedLine Citation:
PMID:  12062895     Owner:  NLM     Status:  MEDLINE    
In this study was investigated the influence of direction and position in the performance of a line extension task by patients with unilateral neglect, with the aim of exploring the role of perceptual and premotor factors in this task. Twenty-three right brain damaged patients (14 patients with left unilateral neglect) were asked to extend horizontal lines both leftward and rightward; lines were presented in three different positions (left, right and central). Patients with neglect significantly overextended the lines in all conditions, but particularly toward the sagittal mid plane of the body and leftward when the line was presented on the right. The global overextension seem to be related to concomitant hemianopsia. A crucial finding in neglect group was that left extensions reduced progressively on passing from right through central to left presentation, particularly in patients with lesions involving frontal regions or the basal ganglia. The last finding supports the hypothesis that left overextension does not exclude the coexistence of both perceptual and premotor factors (causing directional hypometria) in left unilateral neglect.
Giuliano Geminiani; Emanuela Camaschella; Claudio Mariani; Margherita Alberoni; Elisabetta Farina
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuropsychologia     Volume:  40     ISSN:  0028-3932     ISO Abbreviation:  Neuropsychologia     Publication Date:  2002  
Date Detail:
Created Date:  2002-06-13     Completed Date:  2002-09-24     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0020713     Medline TA:  Neuropsychologia     Country:  England    
Other Details:
Languages:  eng     Pagination:  1834-40     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Elsevier Science Ltd.
Dipartimento di Psicologia, Universita' di Torino, Italy.
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MeSH Terms
Aged, 80 and over
Basal Ganglia / pathology
Body Image*
Frontal Lobe / pathology
Middle Aged
Motor Skills Disorders / etiology
Perceptual Disorders / complications,  physiopathology*
Task Performance and Analysis

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