Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Rate dependence of human visual cortical response due to brief stimulation: An event-related fMRI study
Autore:
Ozus, B; Liu, HL; Chen, L; Iyer, MB; Fox, PT; Gao, JH;
Indirizzi:
Univ Texas, Hlth Sci Ctr, Res Imaging Ctr, San Antonio, TX 78284 USA Univ Texas San Antonio TX USA 78284 maging Ctr, San Antonio, TX 78284 USA Univ Sci & Technol China, Beijing Lab Cognit Sci, Beijing, Peoples R ChinaUniv Sci & Technol China Beijing Peoples R China ijing, Peoples R China
Titolo Testata:
MAGNETIC RESONANCE IMAGING
fascicolo: 1, volume: 19, anno: 2001,
pagine: 21 - 25
SICI:
0730-725X(200101)19:1<21:RDOHVC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
CEREBRAL BLOOD-FLOW; STIMULUS RATE; STRIATE CORTEX; FREQUENCY; BRAIN; BOLD;
Keywords:
MRI; fMRI; event-related; visual cortex; stimulus frequency;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Gao, JH Univ Texas, Hlth Sci Ctr, Res Imaging Ctr, 7703 Floyd Curl Dr, SanAntonio, TX 78284 USA Univ Texas 7703 Floyd Curl Dr San Antonio TX USA 78284 X 78284 USA
Citazione:
B. Ozus et al., "Rate dependence of human visual cortical response due to brief stimulation: An event-related fMRI study", MAGN RES IM, 19(1), 2001, pp. 21-25

Abstract

The human brain response to a wide range of visual stimulus rates presented over a prolonged time period has been investigated by various neuroimaging techniques. However, to date, no imaging study has been performed to study the dynamic human brain response to various stimulus rates when presentedin a short time. This report describes activation in the human brain due to brief visual stimulus presentation (1 s) for stimulus rates varying from 1 to 20 Hz using event-related functional MRI (fMRI). Our results show thatthe amplitude of the fMRI response increases with the stimulus frequency and plateaus at 6 Hz. This finding differs slightly from the results of previous blocked task paradigm experiments (with a longer time of stimulus presentation), in which the response peaks at approximately 8 Hz and then decreases. Our results are in close agreement with previously published psychophysical studies, suggesting that the fMRI signal in this experiment is indicative of cortical activity related to visual processing. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 12:20:20