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Titolo:
'Where' depends on 'what': A differential functional anatomy for position discrimination in one- versus two-dimensions
Autore:
Fink, GR; Marshall, JC; Weiss, PH; Shah, NJ; Toni, I; Halligan, PW; Zilles, K;
Indirizzi:
Univ Dusseldorf, Neurol Klin, D-4000 Dusseldorf, Germany Univ Dusseldorf Dusseldorf Germany D-4000 in, D-4000 Dusseldorf, Germany KFA Julich GmbH, Forschungszentrum, Inst Med, D-52425 Julich, Germany KFA Julich GmbH Julich Germany D-52425 Inst Med, D-52425 Julich, Germany Univ Oxford, Radcliffe Infirm, Dept Clin Neurol, Neuropsychol Unit, Oxford, England Univ Oxford Oxford England n Neurol, Neuropsychol Unit, Oxford, England Univ Wales Coll Cardiff, Sch Psychol, Cardiff CF1 1XL, S Glam, Wales Univ Wales Coll Cardiff Cardiff S Glam Wales CF1 1XL 1 1XL, S Glam, Wales Univ Dusseldorf, C&O Vogt Hirnforsch Inst, D-4000 Dusseldorf, Germany UnivDusseldorf Dusseldorf Germany D-4000 st, D-4000 Dusseldorf, Germany
Titolo Testata:
NEUROPSYCHOLOGIA
fascicolo: 13, volume: 38, anno: 2000,
pagine: 1741 - 1748
SICI:
0028-3932(2000)38:13<1741:'DO'AD>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN EXTRASTRIATE CORTEX; VISUOSPATIAL NEGLECT; VISUAL-ATTENTION; BRAIN; OBJECT; DISSOCIATION; INFORMATION; ACTIVATION; PATHWAYS; STROKE;
Keywords:
visuospatial; neuroimaging; judgement; landmark task;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Fink, GR KFA Julich GmbH, Forschungszentrum, Inst Med, D-52425 Julich, Germany KFA Julich GmbH Julich Germany D-52425 D-52425 Julich, Germany
Citazione:
G.R. Fink et al., "'Where' depends on 'what': A differential functional anatomy for position discrimination in one- versus two-dimensions", NEUROPSYCHO, 38(13), 2000, pp. 1741-1748

Abstract

Line bisection is widely used as a clinical test of spatial cognition in patients with left visuospatial neglect after right hemisphere lesion. Surprisingly, many neglect patients who show severe impairment on marking the center of horizontal lines can accurately mark the center of squares. That these patients with left neglect are also typically poor at judging whether lines are correctly prebisected implies that the deficit can be perceptual rather than motoric. These findings suggest a differential neural basis for one- and two-dimensional Visual position discrimination that we investigated with functional neuroimaging (fMRI). Normal subjects judged whether, in premarked lines or squares, the mark was placed centrally. Line center judgements differentially activated right parietal cortex, while square center judgements differentially activated the lingual gyrus bilaterally. These distinct neural bases for one- and two-dimensional visuospatial judgements help explain the observed clinical dissociations by showing that as a stimulusbecomes a better, more 'object-like' gestalt, the ventral visuoperceptive route assumes more responsibility for assessing position within the object. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 06:45:43