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. 2015 Jan 20;8:255. doi: 10.3389/fnsys.2014.00255

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Copyright © 2015 van de Berg, Guinand, Nguyen, Ranieri, Cavuscens, Guyot, Stokroos, Kingma and Perez-Fornos.

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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Asymmetry-index vs. modulation frequency. (A) Each panel represents individual results obtained during stimulation for each stimulation site (SAN, LAN, PAN). (B) Mean results (±SEM) calculated across patients for each stimulation site (gray plots) and for all electrodes together (black plot).