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Titolo:
Post-stimulus response in hemodynamics observed by functional magnetic resonance imaging - difference between the primary sensorimotor area and the supplementary motor area
Autore:
Nakai, T; Matsuo, K; Kato, C; Takehara, Y; Isoda, H; Moriya, T; Okada, T; Sakahara, H;
Indirizzi:
MITI, AIST, Med Vis Lab, Osaka, Japan MITI Osaka JapanMITI, AIST, Med Vis Lab, Osaka, Japan Toyohashi Sozo Coll, Dept Management Informat, Toyohashi, Aichi, Japan Toyohashi Sozo Coll Toyohashi Aichi Japan ormat, Toyohashi, Aichi, Japan Hamamatsu Univ, Sch Med, Dept Radiol, Hamamatsu, Shizuoka 43131, Japan Hamamatsu Univ Hamamatsu Shizuoka Japan 43131 atsu, Shizuoka 43131, Japan Natl Inst Physiol Sci, Okazaki, Aichi 444, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 444 , Okazaki, Aichi 444, Japan
Titolo Testata:
MAGNETIC RESONANCE IMAGING
fascicolo: 10, volume: 18, anno: 2000,
pagine: 1215 - 1219
SICI:
0730-725X(200012)18:10<1215:PRIHOB>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
CEREBRAL BLOOD-FLOW; OXIDATIVE-METABOLISM; OXYGENATION CHANGES; BRAIN ACTIVATION; VISUAL-CORTEX; MRI; STIMULATION; MOVEMENTS; BOLD; SPECTROSCOPY;
Keywords:
functional magnetic resonance imaging (fMRI); blood oxygen level dependency (BOLD); hemodynamic response; supplementary motor area; echo planar imaging (EPI);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Nakai, T MITI, AIST, Med Vis Lab, Osaka, Japan MITI Osaka JapanMITI, AIST, Med Vis Lab, Osaka, Japan
Citazione:
T. Nakai et al., "Post-stimulus response in hemodynamics observed by functional magnetic resonance imaging - difference between the primary sensorimotor area and the supplementary motor area", MAGN RES IM, 18(10), 2000, pp. 1215-1219

Abstract

The blood oxygen level dependency (BOLD) contrast is a useful tool for functional neuroimaging based on the hemodynamic response to neuronal activation. We observed different hemodynamic responses in the BOLD signal between the primary sensorimotor area (SM1) and the supplementary motor area (SMA) in the sequential finger movement task. In the SMA, a stronger initial overshoot and a post-stimulus overshoot were observed. It was hypothesized fromthe time course analysis that the stronger initial overshoot reflected theactivation of the SMA for motor control programming in the initial phase. Although the post-stimulus overshoot may be partially explained by cerebralblood flow (CBF) cerebral blood volume (CBV) uncoupling, its mechanism remained unknown. In the SM1, only the initial overshoot was observed and the level of BOLD signal was almost constant after the initial overshoot duringthe task period. These observations suggested that the BOLD signal is characterized by both CBF-CBV uncoupling and the neuronal activation characteristics in each region. (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 01/12/20 alle ore 08:24:28