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. 2020 Dec 7;21:53. doi: 10.1186/s12868-020-00604-1

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Effects of conditioning pain modulation and distraction by a cognitive task on pain intensity and evoked potential after painful cutaneous electrical stimulation (PCES) at baseline and during both interventions. a Changes in PCES-induced pain intensity and b amplitudes of the evoked potential after painful cutaneous electrical stimulation (PCES-EP). Data are presented as mean ± standard deviation. * p = 0.001 for ANOVA with within factors “time” (“at baseline” and “during intervention”) and “intervention” (“conditioned pain modulation” and “distraction by a cognitive task”), indicating significant interaction between “time” and “intervention”