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Titolo:
LESION LOCATION INFLUENCES PERCEPTION OF HOMONYMOUS SCOTOMAS DURING FLICKERING RANDOM-DOT PATTERN STIMULATION
Autore:
SCHIEFER U; SKALEJ M; KOLB M; DIETRICH TJ; KOLB R; BRAUN C; PETERSEN D;
Indirizzi:
UNIV TUBINGEN,HOSP EYE,DEPT 2,SCHLEICHSTR 12-16 D-72076 TUBINGEN GERMANY RADIOL CLIN,DEPT NEURORADIOL D-72076 TUBINGEN GERMANY DEPT MED PSYCHOL & BEHAV NEUROBIOL D-72076 TUBINGEN GERMANY
Titolo Testata:
Vision research
fascicolo: 9, volume: 38, anno: 1998,
pagine: 1303 - 1312
SICI:
0042-6989(1998)38:9<1303:LLIPOH>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN VISUAL-CORTEX; POSITRON EMISSION TOMOGRAPHY; HUMAN BRAIN; BLINDNESS; NEURONS; VISION; SYSTEM; MOTION;
Keywords:
DYNAMIC NOISE-FIELD; WHITE NOISE; FLICKERING RANDOM DOT PATTERN; WHITE NOISE-FIELD CAMPIMETRY; FMRI; HOMONYMOUS HEMIANOPIA; VISUAL PATHWAY; FILLING-IN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
U. Schiefer et al., "LESION LOCATION INFLUENCES PERCEPTION OF HOMONYMOUS SCOTOMAS DURING FLICKERING RANDOM-DOT PATTERN STIMULATION", Vision research, 38(9), 1998, pp. 1303-1312

Abstract

An attempt was made to clarify whether the site of postchiasmal lesions affects subjective perception of homonymous visual field defects during stimulation with flickering random dot patterns (white noise-field). Out of 56 patients with homonymous hemianopia, 38 (68%) perceived scotomata in this situation, but 18 (32%) discerned none at all. Neuroradiologic superposition of cerebral lesions detected by computed tomography (CT) or magnetic resonance imaging (MRI) showed that nearly allpatients who perceived their scotomata had lesions involving the primary visual cortex or the perigeniculate region, whereas those who received no scotoma had lesions centered within the optic radiation. Functional MRT of six normal subjects during stimulation with flickering random dot patterns indicated predominant activation of the primary visual cortex. Since noise-field defects were most frequently perceived bypatients whose lesion involved the primary visual cortex, it appears that the sensitivity of noise-field campimetry depends on the site of damage in the visual pathway. The explanation for this may be that damage to long-range horizontal connections impairs filling-in processes. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 02:08:14