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Titolo:
VISUOSPATIAL NEGLECT - THE ULTIMATE DECONSTRUCTION
Autore:
HALLIGAN PW; MARSHALL JC;
Indirizzi:
UNIV OXFORD,RIVERMEAD REHABIL CTR,ABINGDON RD OXFORD OX1 4XD ENGLAND UNIV OXFORD,DEPT EXPT PSYCHOL OXFORD OX1 4XD ENGLAND UNIV OXFORD,DEPT CLIN NEUROL,NEUROPSYCHOL UNIT OXFORD ENGLAND
Titolo Testata:
Brain and cognition
fascicolo: 3, volume: 37, anno: 1998,
pagine: 419 - 438
SICI:
0278-2626(1998)37:3<419:VN-TUD>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIGHT-HEMISPHERE DAMAGE; LINE BISECTION; VISUAL NEGLECT; SPATIAL REPRESENTATIONS; UNILATERAL NEGLECT; PATIENT; DISSOCIATION; ATTENTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
P.W. Halligan e J.C. Marshall, "VISUOSPATIAL NEGLECT - THE ULTIMATE DECONSTRUCTION", Brain and cognition, 37(3), 1998, pp. 419-438

Abstract

Unilateral visuospatial neglect is now widely acknowledged to be a highly heterogeneous condition: The overt manifestations of visual neglect can vary as a function of task, spatial domain, and mode of response (at least). Double dissociations (sometimes of the strong form) havealready been reported between most of the components of what was originally thought to be a relatively stable construct within the visual modality. Nonetheless, throughout successive fractionations of neglect,reported cases of bidirectional task-specific neglect after unilateral brain damage are rare. We now report two such cases. After right hemisphere stroke, the first patient reliably showed severe left neglect on cancellation but right neglect on line bisection. After left hemisphere stroke, the second case showed right neglect on cancellation but left neglect on line bisection. Extensive investigation of case 1 confirmed our previous conjecture that the crucial distinction between these tasks lies in the presence or the absence of an overt target. In contrast to cancellation, line bisection demands the internal computation of the location of the ''target'' (the midpoint), followed by executing a motor response toward the precise location of that ''imaginary''midpoint. The relative attentional and premotor contributions of the intact and damaged hemispheres to these forms of bidirectional neglectare also assessed. (C) 1998 Academic Press.

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Documento generato il 21/01/20 alle ore 07:05:31