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. 2020 Apr 27;10:7020. doi: 10.1038/s41598-020-63811-0

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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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Overview of the experimental design. (A) The experiment took place on two consecutive days and included an acquisition session (day one), an extinction session (day one), a first re-extinction session to test for spontaneous recovery, and a second re-extinction session to test for recovery following reinstatement (day two). The conditioned stimuli (CS) consisted of two images of snakes obtained from the freely available International Affective Picture System (IAPS) database (https://csea.phhp.ufl.edu/media/iapsmessage.html). An illustration of these images are displayed in the figure. (B) During the 1-back (Low-Load) working memory group participants were instructed to press a button when the current digit had appeared one positions back in the sequence. For the 2-back (High-Load) working memory group participants were instructed to press a button when the current digit had appeared one positions back in the sequence.