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. 2017 Jul 18;7:5718. doi: 10.1038/s41598-017-06408-4

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© The Author(s) 2017

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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Correlation analysis of behavioral parameters. Correlation was analyzed using the Spearman rank-order on data obtained from cocaine pre-exposed and cocaine challenged rats. (a) A significant correlation was observed between reward latency and the P3 + P4 combined score (i.e., the disadvantageous choice) in the averse-paired and seeking-paired group. (b) There was only a significant correlation between premature responses and the P3 + P4 combined score in the seeking-isolated group. (c) There was no significant correlation between the perseverative response and P3 + P4 combined score in any group. (d) There was a significant correlation between the correct response latency and omission in all the groups, except the seeking-isolated group.