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. 2020 Jun 8;10:9221. doi: 10.1038/s41598-020-66332-y

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© The Author(s) 2020

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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Stimulus polarity and average A- and B-fiber response magnitudes, for different pulse widths and inter-electrode distances. (a,b) Average (mean ±SEM, 4 animals) response magnitudes of A- and B-fibers, respectively, to stimuli with short pulse width (100 μs), delivered through a bipolar electrode with 1 mm-inter-electrode distance (IED). Shown are the responses to both polarities, as a function of stimulus intensity. Blue asterisks denote statistically significant intensity levels at which anodal block of the corresponding fibers occurred (i.e. the response to cathode cephalad polarity became smaller that of the cathode caudad; paired t-test, p < 0.05). (c,d) Same as before (panels a,b), with an IED of 2 mm. (e,f) Comparison of average response magnitudes of A- and B-fibers, respectively, for cathode cephalad polarity, between 1 mm- and 2 mm-IED, for short pulse widht: 100 μs (paired t-test, p NS). (g,h) Average response magnitudes of A- and B-fibers, respectively, to stimuli with long pulse width (1000 μs), delivered with an IED of 1 mm (paired t-test; blue asterisks denote p < 0.05). (i,j) Same as before (panels g,h), but with an IED of 2 mm (paired t-test; blue asterisks denote p < 0.05). (k,l) Comparison between 1 mm- and 2 mm-IED similarly to panels e and f, but for long pulse width: 1000 μs (paired t-test, fig. k p = 0.05; fig. l p NS).