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Titolo:
Effects of repetition rate of electric stimulation on MEG and fMRI signals
Autore:
Iramina, K; Kamei, H; Yumoto, M; Ueno, S;
Indirizzi:
Univ Tokyo, Dept Biomed Engn, Tokyo 1130033, Japan Univ Tokyo Tokyo Japan 1130033 o, Dept Biomed Engn, Tokyo 1130033, Japan Univ Tokyo, Univ Hosp, Tokyo 1138655, Japan Univ Tokyo Tokyo Japan 1138655 iv Tokyo, Univ Hosp, Tokyo 1138655, Japan
Titolo Testata:
IEEE TRANSACTIONS ON MAGNETICS
fascicolo: 4, volume: 37, anno: 2001,
parte:, 1
pagine: 2918 - 2920
SICI:
0018-9464(200107)37:4<2918:EORROE>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOMATOSENSORY CORTEX; NERVE-STIMULATION; MAGNETOENCEPHALOGRAPHY; MRI;
Keywords:
brain dipole moment; brain signal power; fMRI; MEG; somatosensory response;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Iramina, K Univ Tokyo, Dept Biomed Engn, Tokyo 1130033, Japan Univ Tokyo Tokyo Japan 1130033 med Engn, Tokyo 1130033, Japan
Citazione:
K. Iramina et al., "Effects of repetition rate of electric stimulation on MEG and fMRI signals", IEEE MAGNET, 37(4), 2001, pp. 2918-2920

Abstract

This study focuses on the physiological responses of somatosensory stimulation using magnetoencephalography (MEG) and functional MRI (fMRI). To investigate the relationship between neural activity and hemodynamic responses, the effect of the stimulus rate of electrical stimulation to the right thumb was investigated. In order to evaluate the blood oxygenation level dependent (BOLD) effects, signal power was calculated. The signal power is the integrated value from the beginning of the stimulation to the end of the sustained response, the point at which the signal recovers to the baseline. Thesignal power of fMRI and the dipole moment of MEG responses were compared. The MEG signals were measured using a 122-channel whole head SQUID system. When the stimulus frequencies were changed from 0.5 Hz to 10 Hz, the dipole moments of the M20 and M30 components of MEG signals were the largest at 1 Hz and 2 Hz, respectively. A maximum signal power of fMRI occurs at a frequency higher than 2 Hz, approximately at 3 Hz or 5 Hz, and then decreases progressively. These results are in agreement with a previous positron emission tomography (PET) experiment; however, they do not concur with this MEGexperiment.

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Documento generato il 01/04/20 alle ore 23:32:16