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Titolo:
HEMISPHERIC-SPECIALIZATION FOR GLOBAL AND LOCAL PROCESSING - THE EFFECT OF STIMULUS CATEGORY
Autore:
FINK GR; MARSHALL JC; HALLIGAN PW; FRITH CD; FRACKOWIAK RSJ; DOLAN RJ;
Indirizzi:
INST NEUROL,WELLCOME DEPT COGNIT NEUROL,12 QUEEN SQ LONDON WC1N 3BG ENGLAND UNIV OXFORD,RADCLIFFE INFIRM,DEPT CLIN NEUROL,NEUROPSYCHOL UNIT OXFORD OX2 6HE ENGLAND RIVERMEAD REHABIL CTR OXFORD OX1 4XD ENGLAND ROYAL FREE HOSP,SCH MED LONDON NW3 ENGLAND
Titolo Testata:
Proceedings - Royal Society. Biological Sciences
fascicolo: 1381, volume: 264, anno: 1997,
pagine: 487 - 494
SICI:
0962-8452(1997)264:1381<487:HFGALP>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON-EMISSION TOMOGRAPHY; SELECTIVE ATTENTION; VISUAL-CORTEX; HUMANS; AREAS; ORGANIZATION; V2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
G.R. Fink et al., "HEMISPHERIC-SPECIALIZATION FOR GLOBAL AND LOCAL PROCESSING - THE EFFECT OF STIMULUS CATEGORY", Proceedings - Royal Society. Biological Sciences, 264(1381), 1997, pp. 487-494

Abstract

Neuropsychological evidence indicates that the global aspect of complex visual scenes is preferentially processed by the right hemisphere, and local aspects are preferentially processed by the left hemisphere. Using letter-based hierarchical stimuli (Navon figures), we recently demonstrated, in a directed-attention task, lateralized neural activity (assessed by positron emission tomography) in the left prestriate cortex during local processing, and in the right prestriate cortex during global processing. Furthermore, temporal-parietal cortex was critically activated bilaterally in a divided-attention task that involved varying the number of target switches between local and global levels ofletter-based hierarchical stimuli. Little is known about whether suchstimulus categories influence such hemispheric lateralization. We nowpresent data on brain activity, derived from positron emission tomography, in normal subjects scanned during either local or global processing of object-based hierarchical stimuli. We again observe attentionalmodulation of neural activity in prestriate cortex. There is now greater right-sided activation for local processing and greater left-sidedactivation for global processing, which is the opposite of that seen with letter-based stimuli. The results suggest that the relative differential hemispheric activations in the prestriate areas during global and local processing are modified by stimulus category.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 06:37:25