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Titolo:
SPACE-BASED AND OBJECT-BASED VISUAL-ATTENTION - SHARED AND SPECIFIC NEURAL DOMAINS
Autore:
FINK GR; DOLAN RJ; HALLIGAN PW; MARSHALL JC; FRITH CD;
Indirizzi:
INST NEUROL,WELLCOME DEPT COGNIT NEUROL,QUEEN SQ LONDON WC1N 3BG ENGLAND ROYAL FREE HOSP,SCH MED LONDON ENGLAND UNIV OXFORD,RADCLIFFE INFIRM,RIVERMEAD REHABIL CTR OXFORD OX2 6HE ENGLAND UNIV OXFORD,RADCLIFFE INFIRM,DEPT CLIN NEUROL,NEUROPSYCHOL UNIT OXFORD OX2 6HE ENGLAND
Titolo Testata:
Brain
, volume: 120, anno: 1997,
parte:, 11
pagine: 2013 - 2028
SICI:
0006-8950(1997)120:<2013:SAOV-S>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; POSTERIOR PARIETAL CORTEX; HUMAN EXTRASTRIATE CORTEX; SELECTIVE ATTENTION; EYE-MOVEMENTS; UNILATERAL NEGLECT; SPATIAL ATTENTION; PET; FIXATION; LESIONS;
Keywords:
VISUAL ATTENTION; PET; PARIETAL CORTEX; PRESTRIATE CORTEX; VISUAL NEGLECT;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
58
Recensione:
Indirizzi per estratti:
Citazione:
G.R. Fink et al., "SPACE-BASED AND OBJECT-BASED VISUAL-ATTENTION - SHARED AND SPECIFIC NEURAL DOMAINS", Brain, 120, 1997, pp. 2013-2028

Abstract

Visual attention cart be primarily allocated to either where an object is in space (with little emphasis on the structure of the object itself) or to the structure of the object (with little emphasis on where in space the object is located). Using PET measures of regional cerebral blood flow (rCBF) to index neural activity, we investigated the shared and specific functional anatomy underlying both of these types of visual attention in a controlled non-cueing non-blocked paradigm that involved identical stimuli across the conditions of interest. The interaction of eye movements with these attentional systems was studied byintroducing fixation or free vision as an additional factor: Relativeto the control condition, object-based and space-based attention showed significant activations of the left and right medial superior parietal cortex and the left lateral inferior parietal cortex, the left prefrontal cortex and the cerebellar vermis. Significant differential activations were observed during object-based attention in the left striate and prestriate cortex. Space-based attention activated the right prefrontal cortex and the right inferior temporal-occipital cortex. Differential neural activity due to free vision or fixation was observed in occipital areas only. Significant interactions of free vision/fixation on activations due to object-based and space-based attention were observed in the right medial superior parietal cortex and left lateral inferior parietal cortex, respectively The study provides direct evidence for the importance of the parietal cortex in the control of object-based and space-based visual attention. The results show that object-based and space-based attention share common neural mechanisms in the parietal lobes, in addition to task specific mechanisms in early visual processing areas of temporal and occipital cortices.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 09:22:20