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Titolo:
PERCEPTION AND ACTION IN HEMISPATIAL NEGLECT
Autore:
BARTOLOMEO P; DERME P; PERRI R; GAINOTTI G;
Indirizzi:
CTR PAUL BROCA,INSERM U324,2TER RUE DALESIA F-75014 PARIS FRANCE UNIV SACRED HEART,INST NEUROL I-00168 ROME ITALY
Titolo Testata:
Neuropsychologia
fascicolo: 3, volume: 36, anno: 1998,
pagine: 227 - 237
SICI:
0028-3932(1998)36:3<227:PAAIHN>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNILATERAL SPATIAL NEGLECT; DIRECTIONAL MOTOR NEGLECT; SIMPLE REACTION-TIME; LINE BISECTION; RIGHT-HEMISPHERE; VISUAL NEGLECT; READING HABITS; HYPOKINESIA; ATTENTION; LESIONS;
Keywords:
DIRECTIONAL HYPOKINESIA; SPATIAL REFERENCE FRAMES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
P. Bartolomeo et al., "PERCEPTION AND ACTION IN HEMISPATIAL NEGLECT", Neuropsychologia, 36(3), 1998, pp. 227-237

Abstract

Hemispatial neglect is a neurological disorder which entails a spatial bias that penalizes events occurring in the hemispace contralateral to a brain lesion. Mechanisms operating upon various stages ranging from perception to action have been invoked to explain neglect. The present study explores the contribution of a defective programming of arm movements towards the neglected hemispace to neglect behaviour. Two reaction time tasks - a ''perceptual'' task and a ''motor'' task - were performed by right brain-damaged (RBD) patients with left hemispatial neglect, RED patients without signs of neglect and control subjects. The perceptual task consisted of lateralized visual stimuli and centralmotor responses, whereas the motor task consisted of visual stimuli presented on the vertical midline and hand responses to be produced in either hemispace. Neglect patients showed a rightward bias on the perceptual task, but only two RED patients (showing no signs of severe neglect) were consistently slowed in producing leftward motor responses. Different reference frames may thus be used in perceptual tasks and tasks involving arm movements. We conclude that hemispatial neglect commonly results from attentional impairments operating upon a visual perceptual frame of reference; additional deficits appear to be necessary to produce a directional motor disorder. (C) 1998 Elsevier Science Ltd. All rights reserved.

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Documento generato il 28/11/20 alle ore 00:49:36