By Topic

Effects of stimulus intensity on fMRI and MEG in somatosensory cortex using electrical stimulation

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

7 Author(s)
K. Iramina ; Dept. of Biomed. Eng., Tokyo Univ., Japan ; H. Kamei ; S. Uchida ; T. Kato
more authors

To clarify the relationship between neuronal activity and the hemodynamic response, activations of the primary somatosensory cortex were studied using MEG (magnetoencephalogram) and fMRI (functional magnetic resonance imaging). Effects of stimulus intensity by electrical stimulation to the right thumb was investigated. The authors focused on the number of activated pixels, time courses of hemodynamic response obtained by fMRI, and dipole moments of neuromagnetic activity. For fMRI experiments, a number of activated pixels and signal power, which was defined as the integrated value of MR signal, greatly increased when an increase in stimulus intensity generated pain. This trend, however, did not correspond to the observed MEG responses. When the stimulus intensity changed, fMRI responses showed the different tendency of MEG responses

Published in:

IEEE Transactions on Magnetics  (Volume:35 ,  Issue: 5 )