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Titolo:
Functional specificity of superior parietal mediation of spatial shifting
Autore:
Vandenberghe, R; Gitelman, DR; Parrish, TB; Mesulam, MM;
Indirizzi:
Northwestern Univ, Sch Med, Cognit Neurol & Alzheimers Dis Ctr, Chicago, IL 60608 USA Northwestern Univ Chicago IL USA 60608 ers Dis Ctr, Chicago, IL 60608 USA Univ Hosp Gasthuisberg, Dept Neurol, B-3000 Louvain, Belgium Univ Hosp Gasthuisberg Louvain Belgium B-3000 l, B-3000 Louvain, Belgium Katholieke Univ Leuven, Fac Med, Louvain, Belgium Katholieke Univ Leuven Louvain Belgium euven, Fac Med, Louvain, Belgium
Titolo Testata:
NEUROIMAGE
fascicolo: 3, volume: 14, anno: 2001,
pagine: 661 - 673
SICI:
1053-8119(200109)14:3<661:FSOSPM>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; FRONTAL EYE FIELDS; EVENT-RELATED FMRI; VISUAL-ATTENTION; ASSOCIATION CORTEX; CORTICOCORTICAL CONNECTIONS; VISUOSPATIAL ATTENTION; SELECTIVE ATTENTION; SUSTAINED ATTENTION; OPTIC ATAXIA;
Keywords:
attention; fMRI; functional imaging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
69
Recensione:
Indirizzi per estratti:
Indirizzo: Vandenberghe, R Northwestern Univ, Sch Med, Cognit Neurol & Alzheimers DisCtr, Chicago, IL 60608 USA Northwestern Univ Chicago IL USA 60608 cago, IL 60608 USA
Citazione:
R. Vandenberghe et al., "Functional specificity of superior parietal mediation of spatial shifting", NEUROIMAGE, 14(3), 2001, pp. 661-673

Abstract

Using event-related functional magnetic resonance imaging (fMRI) we determined how brain activity changes when an attended target shifts its location. In the main experiment, a white square could appear at 10 possible eccentricities along the horizontal meridian. It remained on the screen for a variable period of time and then changed location. At any time the stimulus could dim briefly. Subjects had to press a button when the stimulus dimmed. In order to perform this task attention had to be locked onto the target andshift with it. Half of the runs were performed overtly and half covertly. The event of interest consisted of the shift in the location of the attentional target. The state of maintained attention occurring in between the shifts constituted the baseline. The superior parietal gyrus was activated bilaterally in response to attentional shifts. No other area showed a significant response to shifting. On the left side the amplitude of the superior parietal response correlated positively with the distance of the shift. On the right side a significant correlation was present only for overt shifts. In a separate experiment we compared the maintaining of attention at a single spatial location to passive fixation: the frontal eye fields, anterior cingulate, right dorsolateral prefrontal cortex, and inferior parietal lobulewere significantly activated, indicating that the absence of a shift-related response in these areas in the main experiment was due to the fact that;they were equally activated by maintaining and shifting attention. The response to spatial shifts and the correlation with the distance between the original and the new location points to a specific role of the superior parietal gyrus in shifting the locus of spatial attention. (C) 2001 Academic Press.

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Documento generato il 19/01/20 alle ore 09:26:19