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. 2019 Nov 26;16:45. doi: 10.1186/s12989-019-0323-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 7 — PR Schedule of Reinforcement: Measures of breakpoint (a) and percent inactive (incorrect) lever responses (b). Post-hoc Tukey-Kramer group comparisons were performed on breakpoint. Bars indicate the group means ± SE. Only significant results are reported at top of the figure. n = 8–11 per group