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Titolo:
The attentive homunculus: Now you see it, now you don't
Autore:
Nobre, AC;
Indirizzi:
Univ Oxford, Dept Expt Psychol, Oxford OX1 3UD, England Univ Oxford Oxford England OX1 3UD Expt Psychol, Oxford OX1 3UD, England
Titolo Testata:
NEUROSCIENCE AND BIOBEHAVIORAL REVIEWS
fascicolo: 6, volume: 25, anno: 2001,
pagine: 477 - 496
SICI:
0149-7634(200108)25:6<477:TAHNYS>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSTERIOR PARIETAL CORTEX; POSITRON-EMISSION-TOMOGRAPHY; FRONTAL EYE-FIELD; SELECTIVE VISUAL-ATTENTION; LATERAL INTRAPARIETAL AREA; OVERLAPPING NEURAL SYSTEMS; MONKEY CEREBRAL-CORTEX; SPATIAL ATTENTION; SUPERIOR PARIETAL; HUMAN BRAIN;
Keywords:
visual-spatial attention; object-based attention; motor attention; time attention; tactile attention; attentional control; attentional modulation; brain imaging; positron-emission tomography (PET); functional magnetic resonance imaging (fMRI);
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
174
Recensione:
Indirizzi per estratti:
Indirizzo: Nobre, AC Univ Oxford, Dept Expt Psychol, S Parks Rd, Oxford OX1 3UD, England Univ Oxford S Parks Rd Oxford England OX1 3UD OX1 3UD, England
Citazione:
A.C. Nobre, "The attentive homunculus: Now you see it, now you don't", NEUROSCI B, 25(6), 2001, pp. 477-496

Abstract

The nature of the neural system that directs our attention toward selective items in the extrapersonal world is a longstanding and interesting puzzle. The ability to image the human brain at work non-invasively using positron-emission tomography or functional magnetic resonance has provided the means to investigate this issue. In this article, I review the contributions of brain imaging toward the characterization of attentional control in the human brain. The majority of experiments to date have investigated visual spatial orienting. A consistent pattern of brain areas has been revealed, comprising most notably the posterior parietal cortex around the intraparietal sulcus andfrontal regions including the frontal eye fields. The brain areas implicated in the control of visual spatial attention were noted to resemble those involved in the control of eye movements, and direct experimental comparisons supported a tight link between the two systems. The findings suggested asensible view of the attentional. 'homunculus' as a distributed neural system related to the control of eye movements. Eye movements form perhaps themost basic orienting response, and can be shifted rapidly and efficiently based on multiple frames of reference. Some attention experiments using objects and features instead of spatial locations as the target of selection also obtained similar patterns of parietal-frontal activations, rendering further support to this view of the attentional control system. Some recent experiments, however, have cautioned against a premature conclusion regarding the ubiquity of the attentional control system revealed by studies of visual spatial attention. Different parietal and frontal regionsbecome engaged when attention is shifted along nonspatial dimensions, suchas when attention is directed toward a particular motor act or toward a specific point in time. In these cases, the neural system resembles those involved in the control of limb movements. The attentional homunculus thus begins to dissolve. The alternative view suggested is that attentional controlmay be a property of specialized parietal-frontal systems that transform perception into action. Future studies will be needed to validate this view of attention, or to provide a more mature understanding of its true nature. (C) 2001 Published by Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 10:16:17