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. 2020 Dec 31;10:22434. doi: 10.1038/s41598-020-80023-8

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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 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/.

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Group mean percentage CR incidence and standard errors (SE) on days 1, 2, 8 (1 week) and 29 (1 month). Ten blocks a 10 paired CS–US trials were presented on day 1, five blocks a 10 paired CS–US trials on days 2, 8 and 29. In addition, 3 blocks a 10 CS-only extinction trials were presented on day 29. Blue filled circles = anodal group, filled black circles = sham group. * indicates significant effects in post-hoc pairwise comparisons.