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. 2015 Jul 10;232(21-22):4043–4057. doi: 10.1007/s00213-015-4009-8

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© The Author(s) 2015

Open Access This 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.

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Fig. 6 — Successful training and behavioural modulation of the ERC task in the touchscreen apparatus. a Chow consumption across increasing operant work requirements. b Milkshake consumption across increasing operant work requirements. c Enhancement of operant responding following extended exposure to the FR40 versus chow schedule by removal of chow (*p < 0.05; ns not significant) (n = 16 for (a) and (b); n = 15 for (c))