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Titolo:
Integrating electrophysiology and neuroimaging of spatial selective attention to simple isolated visual stimuli
Autore:
Mangun, GR; Hinrichs, H; Scholz, M; Mueller-Gaertner, HW; Herzog, H; Krause, BJ; Tellman, L; Kemna, L; Heinze, HJ;
Indirizzi:
Duke Univ, Ctr Cognit Neurosci, Durham, NC 27708 USA Duke Univ Durham NC USA 27708 , Ctr Cognit Neurosci, Durham, NC 27708 USA Univ Magdeburg, Dept Clin Neurophysiol, D-39106 Magdeburg, Germany Univ Magdeburg Magdeburg Germany D-39106 iol, D-39106 Magdeburg, Germany KFA Julich GmbH, Res Ctr, Dept Nucl Med, D-5170 Julich, Germany KFA JulichGmbH Julich Germany D-5170 t Nucl Med, D-5170 Julich, Germany Univ Dusseldorf, Dept Nucl Med, Duesseldorf, Germany Univ Dusseldorf Duesseldorf Germany Dept Nucl Med, Duesseldorf, Germany KFA Julich GmbH, Res Ctr, Inst Med, D-5170 Julich, Germany KFA Julich GmbH Julich Germany D-5170 , Inst Med, D-5170 Julich, Germany
Titolo Testata:
VISION RESEARCH
fascicolo: 10-11, volume: 41, anno: 2001,
pagine: 1423 - 1435
SICI:
0042-6989(2001)41:10-11<1423:IEANOS>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; NEURAL MECHANISMS; BRAIN POTENTIALS; VISUOSPATIAL ATTENTION; PARIETAL CORTEX; CORTICAL AREAS; EXTRASTRIATE; PET; V4; LOCATION;
Keywords:
electrophysiology; neuroimaging; visual-spatial attention;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Mangun, GR Duke Univ, Ctr Cognit Neurosci, Box 90999, Durham, NC 27708 USADuke Univ Box 90999 Durham NC USA 27708 9, Durham, NC 27708 USA
Citazione:
G.R. Mangun et al., "Integrating electrophysiology and neuroimaging of spatial selective attention to simple isolated visual stimuli", VISION RES, 41(10-11), 2001, pp. 1423-1435

Abstract

Visual-spatial attention involves modulations of activity in human visual cortex as indexed by electrophysiological and functional neuroimaging measures. Prior studies investigating the time course and functional anatomy of spatial attention mechanisms in visual cortex have used higher-order discrimination tasks with complex stimuli (e.g. symbol matching in bilateral stimulus arrays, or letter discrimination), or simple detection tasks but in the presence of complex distracting information (e.g. luminance detection with superimposed symbols as distracters). Here we tested the hypothesis that short-latency modulations of incoming sensory signals in extrastriate visual cortex reflect an early spatially specific attentional mechanism. We sought evidence of attentional modulations of sensory input processing for simple, isolated stimuli requiring only an elementary discrimination (i.e. sizediscrimination). As in prior studies using complex symbols, we observed attention-related changes in regional cerebral blood flow in extrastriate visual cortex that were associated with changes in event-related potentials ata specific latency range. These findings support the idea that early in cortical processing, spatially-specific attentional selection mechanisms can modulate incoming sensory signals based on their spatial location and perhaps independently of higher-order stimulus form. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 14:30:06