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. 2021 Feb 5;11:3228. doi: 10.1038/s41598-021-82526-4

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© The Author(s) 2021

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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Total number of food rewards provided by focal rats to their cooperating and defecting partners in relation to the point in time when they had experienced their partners. Focal rats provided food rewards more often to previously cooperating than to previously defecting partners, which did not differ between partners experienced a longer or shorter while ago. Medians and interquartile ranges are shown of the focal rats’ pulling frequencies for their partners that had been experienced either on days one, two, three or four (each N = 6).