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. 2015 Jul 19;18(6):1267–1284. doi: 10.1007/s10071-015-0895-8

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© The Author(s) 2015

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.

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Fig. 4 — Mean number of responses during the last part of Phase 1 for reinforced components A and B, unreinforced compound AB, unreinforced components C and D and reinforced compound CD. Error bars represent within-subject standard error of the mean for each stimulus as calculated by the SPSS plug-in of O’Brien and Cousineau (2014)