Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Heterogeneity of cingulate contributions to spatial attention
Autore:
Mesulam, MM; Nobre, AC; Kim, YH; Parrish, TB; Gitelman, DR;
Indirizzi:
Northwestern Univ, Sch Med, Cognit Neurol & Alzheimers Dis Ctr, NW Cognit Brain Mapping Grp, Chicago, IL 60611 USA Northwestern Univ Chicago IL USA 60611 Mapping Grp, Chicago, IL 60611 USA Northwestern Univ, Sch Med, Dept Neurol, Chicago, IL USA Northwestern Univ Chicago IL USA , Sch Med, Dept Neurol, Chicago, IL USA Northwestern Univ, Sch Med, Dept Psychiat, Chicago, IL USA Northwestern Univ Chicago IL USA Sch Med, Dept Psychiat, Chicago, IL USA Northwestern Univ, Sch Med, Dept Radiol, Chicago, IL USA Northwestern Univ Chicago IL USA , Sch Med, Dept Radiol, Chicago, IL USA VA Healthcare Syst, Lakeside Div, Chicago, IL USA VA Healthcare Syst Chicago IL USA re Syst, Lakeside Div, Chicago, IL USA Univ Oxford, Dept Expt Psychol, Oxford OX1 3UD, England Univ Oxford Oxford England OX1 3UD Expt Psychol, Oxford OX1 3UD, England
Titolo Testata:
NEUROIMAGE
fascicolo: 6, volume: 13, anno: 2001,
parte:, 1
pagine: 1065 - 1072
SICI:
1053-8119(200106)13:6<1065:HOCCTS>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSTERIOR PARIETAL CORTEX; POSITRON EMISSION TOMOGRAPHY; FRONTAL EYE FIELDS; FUNCTIONAL-ANATOMY; RHESUS-MONKEY; VISUOSPATIAL ATTENTION; HUMAN BRAIN; SELECTION; SACCADES; NETWORK;
Keywords:
frontal; parietal; neural network; cingulate; limbic; spatial attention;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Mesulam, MM Northwestern Univ, Sch Med, Cognit Neurol & Alzheimers Dis Ctr, NW Cognit Brain Mapping Grp, Chicago, IL 60611 USA Northwestern Univ Chicago IL USA 60611 Chicago, IL 60611 USA
Citazione:
M.M. Mesulam et al., "Heterogeneity of cingulate contributions to spatial attention", NEUROIMAGE, 13(6), 2001, pp. 1065-1072

Abstract

Functional magnetic resonance imaging was used to investigate activation patterns within the cingulate region during tasks based on spatial attention. Subjects were asked to detect targets which appeared either at the site indicated by a cue or on the opposite side. A "cue effect" was identified bythe presence of shorter reaction times to validly than invalidly cued targets, showing that an anticipatory bias had been generated in the direction of the cue. Target detection accuracy was consistently above 90% although cue effects and reaction times displayed substantial variations, from one task session to another, Activation within the anterior cingulate region was seen in 16 of the 26 sessions but showed no correlation with reaction time. Posterior cingulate activation was seen in only 16 of the 26 sessions. However, a random effects analysis showed that the task-related signal change in this region was strongly correlated with the speed of target detection. A post hoc analysis indicated that this correlation was significant only when cue effects were present. No other part of the cerebral cortex displayedsignificant correlations with reaction times or cue effects. These resultssuggest that the cingulate component of the attentional network has at least two functionally segregated sectors, an anterior one in BA 24/32 and a posterior cingulo-retrosplenial one in BA 23/29/30, The posterior sector appears to be associated with the speed of detecting spatial targets, especially when attention is under the influence of a cue-induced anticipatory bias. The anterior cingulate focus did not display such a relationship in our tasks and is likely to mediate other aspects of attentional deployment such as performance monitoring, response selection or target identification. (C)2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/20 alle ore 07:17:52