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. 2017 Jun 26;37(13):1285–1293. doi: 10.1177/0333102417717470

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© International Headache Society 2017

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Stimulation conditions (a) at M2-Cz after nVNS over the right paramedian cervical region (first active condition); (b) at M2-Cz after bipolar stimulation over the right inner tragus (second active condition); (c) at M2-Cz after nVNS over the right SCM muscle (control condition).

nVNS: non-invasive vagus nerve stimulation; SCM: sternocleidomastoid.

Stimulations were performed bilaterally, with recordings performed at different electrode positions according to the side of stimulation, but only right stimulation and M2-Cz are depicted in this figure.