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Titolo:
Electrophysiological estimate of human cortical magnification
Autore:
Slotnick, SD; Klein, SA; Carney, T; Sutter, EE;
Indirizzi:
Johns Hopkins Univ, Dept Psychol, Baltimore, MD 21218 USA Johns Hopkins Univ Baltimore MD USA 21218 sychol, Baltimore, MD 21218 USA Univ Calif Berkeley, Dept Vis Sci, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 Vis Sci, Berkeley, CA 94720 USA Neurometr Inst, Berkeley, CA 94720 USA Neurometr Inst Berkeley CA USA 94720 urometr Inst, Berkeley, CA 94720 USA Smith Kettlewell Eye Res Inst, San Francisco, CA 94115 USA Smith Kettlewell Eye Res Inst San Francisco CA USA 94115 co, CA 94115 USA
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 7, volume: 112, anno: 2001,
pagine: 1349 - 1356
SICI:
1388-2457(200107)112:7<1349:EEOHCM>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN STRIATE CORTEX; HUMAN VISUAL-CORTEX; SELECTIVE ATTENTION; SOURCE LOCALIZATION; FIELD SIZE; ECCENTRICITY; POSITION; POTENTIALS; SEPARATION; ACUITY;
Keywords:
cortical magnification; primary visual cortex; human; monkey; visual evoked potential; dipole source localization; functional magnetic resonance imaging; cortical stimulation; psychophysics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Slotnick, SD Johns Hopkins Univ, Dept Psychol, Baltimore, MD 21218 USA Johns Hopkins Univ Baltimore MD USA 21218 more, MD 21218 USA
Citazione:
S.D. Slotnick et al., "Electrophysiological estimate of human cortical magnification", CLIN NEU, 112(7), 2001, pp. 1349-1356

Abstract

Objective: The cortical magnification factor characterizes the area of human primary visual cortex activated by a stimulus as a function of angular distance from an observer's line of sight. This study estimates human cortical magnification using an electrophysiological method with excellent temporal resolution: visual evoked potential (VEP) dipole source localization. Methods: For each of 60 independently modulated checkerboard patches within the central 18 deg of the visual field, location, orientation, magnitude,and time-course of the dipole current source that best described the VEP distribution across a multi-electrode array was obtained. At numerous eccentricities, cortical magnification was determined using two different techniques: (1) the distance between each pair of adjacent stimulus patches was matched to the corresponding distance between adjacent cortical sources; and (2) the area of each stimulus patch was matched to the magnitude of the corresponding cortical source (which was assumed to be proportional to cortical area). Results: The estimates of human cortical magnification using our electrophysiological method were similar to previous estimates from psychophysics, cortical stimulation, and functional magnetic resonance imaging. Conclusions: The concordance of results provided by these disparate technologies, with differing spatial and temporal limitations, supports their combination in studying the spatio-temporal dynamics of human brain function. (C) 2001 Published by Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/20 alle ore 02:13:49