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. 2014 Mar 17;8:158. doi: 10.3389/fnhum.2014.00158

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Copyright © 2014 Nevalainen, Lauronen and Pihko.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Early adult SEFs to median nerve (SEF_MN) and tactile (SEF_T) stimulation. The SEF waveform from one gradiometer channel shows SEF_MN20/SEF_T30 and SEF_MN35/SEF_T50 deflections, and the magnetic contours – reflected on a head surface – reveal the different current orientations (indicated by the pink and blue arrows). Compared with SEF_MN, the SEF_T latencies are slightly longer and amplitudes lower (note the different amplitude scales). Both stimulation methods, however, elicit an initial anteriorly pointing dipolar source, SEF_MN20/SEF_T30 (though in some subjects this deflection is minute to tactile stimulation), followed by a posteriorly pointing dipolar source, SEF_MN35/SEF_T50. The dipoles are superimposed on individual MRIs and both sources are localized in SI.