TY - GEN
T1 - Effects of stimulus intensity of electrical stimulation on functional MRI and MEG
AU - Iramina, K.
AU - Kamei, H.
AU - Kato, T.
AU - Ugurbil, K.
AU - Yumoto, M.
AU - Ueno, S.
PY - 1999
Y1 - 1999
N2 - To clarify the relationships between neuronal activity and the hemodynamic response, activations of the primary somatosensory cortex were studied using MEG (magnetoencepahlogram) and fMRI (functional magnetic resonance imaging). Effects of the stimulus intensity of the electrical stimulation to the right thumb was investigated. We focused on the number of activated pixcels, time courses of hemodynamic response obtained by fMRI and dipole moments of neuromagnetic activity. When the stimulus intensity increased to the pain feeling in the fMRI experiments, a number of activated pixels and signal power which was defined as the integration value of NMR signal were increase steeply, however, this inclination did not correspond to the neuronal activity.
AB - To clarify the relationships between neuronal activity and the hemodynamic response, activations of the primary somatosensory cortex were studied using MEG (magnetoencepahlogram) and fMRI (functional magnetic resonance imaging). Effects of the stimulus intensity of the electrical stimulation to the right thumb was investigated. We focused on the number of activated pixcels, time courses of hemodynamic response obtained by fMRI and dipole moments of neuromagnetic activity. When the stimulus intensity increased to the pain feeling in the fMRI experiments, a number of activated pixels and signal power which was defined as the integration value of NMR signal were increase steeply, however, this inclination did not correspond to the neuronal activity.
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M3 - Conference contribution
AN - SCOPUS:0033330785
SN - 0780356756
T3 - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
BT - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PB - IEEE
T2 - Proceedings of the 1999 IEEE Engineering in Medicine and Biology 21st Annual Conference and the 1999 Fall Meeting of the Biomedical Engineering Society (1st Joint BMES / EMBS)
Y2 - 13 October 1999 through 16 October 1999
ER -