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Titolo:
Interconnected large-scale systems for three fundamental cognitive tasks revealed by functional MRI
Autore:
Hirsch, J; Moreno, DR; Kim, KHS;
Indirizzi:
Cornell Univ, Weill Sch Med Sci,Funct MRI Lab, Grad Sch Med Sci, MSKCC Div, New York, NY 10021 USA Cornell Univ New York NY USA 10021 Sci, MSKCC Div, New York, NY 10021 USA
Titolo Testata:
JOURNAL OF COGNITIVE NEUROSCIENCE
fascicolo: 3, volume: 13, anno: 2001,
pagine: 389 - 405
SICI:
0898-929X(20010401)13:3<389:ILSFTF>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CEREBRAL BLOOD-FLOW; HUMAN BRAIN; NEUROCOGNITIVE NETWORKS; CORTICAL ACTIVATION; RHESUS-MONKEY; MEDIAL WALL; CORTEX; PATHWAYS; MEMORY; ORGANIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Hirsch, J Cornell Univ, Weill Sch Med Sci,Funct MRI Lab, Grad Sch Med Sci,MSKCC Div, 1275 York Ave,S-121,Box 506, New York, NY 10021 USA Cornell Univ 1275 York Ave,S-121,Box 506 New York NY USA 10021 A
Citazione:
J. Hirsch et al., "Interconnected large-scale systems for three fundamental cognitive tasks revealed by functional MRI", J COGN NEUR, 13(3), 2001, pp. 389-405

Abstract

The specific brain areas required to execute each of three fundamental cognitive tasks-object naming, same-different discrimination, and integer computation-are determined by whole-brain functional magnetic resonance imaging(fMRI) using a novel technique optimized for the isolation of neurocognitive systems. This technique (1) conjoins the activity associated with identical or nearly identical tasks performed in multiple sensory modalities (conjunction) and (2) isolates the activity conserved across multiple subjects (conservation). Cortical regions isolated by this technique are, thus, presumed associated with cognitive Functions that are both distinguished from primary sensory processes and from individual differences. The object-namingsystem consisted of four brain areas: left inferior frontal gyrus, Brodmann's areas (BAs) 45 and 44; left superior temporal gyrus. BA 22; and left medial frontal gyrus, BA 6. The same-different discrimination system consisted of three brain areas: right inferior parietal lobule, BA 40; right precentral gyrus, BA 6; and left medial frontal gyrus, BA 6. The integer computation system consisted of five brain areas: right middle frontal gyrus, BA 6:right precentral gyrus, BA 6; left inferior parietal lobule, BA 40; left inferior frontal gyrus. BA 44; and left medial frontal gyrus, BA 6. All three neurocognitive systems shared one common conical region, the left medial frontal gyrus, the object-naming and integer computation systems shared theleft inferior frontal gyrus, and the integer computation and same-different discrimination systems shared the right precentral gyrus. These results are consistent with connectionist models of cognitive processes where specific sets of remote brain areas are assumed to be transiently bound together as functional units to enable these functions, and further suggest a superorganization of neurocognitive systems where single brain areas serve as elements of multiple functional systems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 01:10:29