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. 2018 Mar 29;8:5377. doi: 10.1038/s41598-018-23694-8

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© The Author(s) 2018

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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Population plot: Delay-2 filtering. Normalised firing rate for cells that show a significant effect of Stimulus across the four trial types during the Delay-2 period. The ITI represents the entire 5 s ITI period, Sample represents a 300 ms period, and Delay-1 and Delay-2 represent the first and second second of the 2 s (for S1 and S3) or 8 s (for L1 and L3) delay period. Reward-1 is the first second of reward presentation. In S1 and S3, therefore, Reward-1 occurs after the 2 s delay period, whereas in L1 and L3 Reward-1 occurs after the 8 s delay period.