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. 2018 Aug 30;8:13067. doi: 10.1038/s41598-018-31247-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Volume ratios for different stimulus pulse widths. Volume ratios for electrodes spaced 400 μm apart longitudinally (A) and transversely (B) for different pulse widths. Results shown are for a 15 μm diameter fiber. Ratios are plotted as a function of the volume of tissue recruited during asynchronous stimulation, our measure of stimulation strength/effectiveness, rather than amplitude or charge per phase. Longer pulse-widths had larger changes in recruitment volume during synchronous stimulation.