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. 2020 Jan 27;10:1202. doi: 10.1038/s41598-020-57934-7

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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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Square-root transformed (sqrt) and range-corrected skin conductance responses (SCRs) [T-scores] presented separately for participants who received verbal instructions that no further US will be applied prior to extinction training (VIE group, upper panel), participants for whom the US electrode was removed in addition to verbal instructions (VIE-R group, middle panel) and participants who received no instruction prior to extinction training (UE group, lower panel). Responses during CS +, CS- and ITIs are averaged for the four trials of pre-conditioning (PRE), for each two trials during acquisition and extinction training and for the each four trials of the first re-exposure to the CSs after 24 h (RE1) and the second re-exposure to the CSs after reattachment of the US electrode (RE2). Error bars represent standard errors of the mean.