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. 2020 Mar 9;10:4287. doi: 10.1038/s41598-020-61257-y

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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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Experiment 1 (N = 35, unpredictable alternation of low and high reward trials): high vs. low reward contrast at cue presentation (top row) and during the foraging patches (bottom row). The blue ovals in the top row show striatal activation commented on the text. The red arrows in the bottom row point to activations in the dopaminergic brainstem. On the right, contrast estimates and relative confidence intervals in the nucleus accumbens and ventral tegmental area. Colors show t values for the contrast of interest, thresholded for illustration purposes at p < 0.005, uncorrected, overlaid on a template brain. NAcc: nucleus accumbens; VTA: ventral tegmental area; C.I.: confidence intervals.