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. 2015 Oct 12;9:273. doi: 10.3389/fnbeh.2015.00273

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Copyright © 2015 Yan, Rizak, Wang, Yang, Ma and Hu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The preference scores in the 3 days of each CPP testing. No decay was found during each testing. (A) The preference scores of the three groups before CPP conditioning (F_{(2, 9)} = 0.012, P = 0.989 for control group, F_{(2, 12)} = 0.031, P = 0.970 for group I, F_{(2, 6)} = 0.039, P = 0.962 for group II). (B) The preference scores of the three groups during the 0 month-CPP phase (F_{(2, 9)} = 0.561, P = 0.590 for control group, F_(2,12) = 0.158, P = 0.855 for group I, F_{(2, 6)} = 0.473, P = 0.645 for group II). (C) The preference scores of group I and control group during the 12 month-CPP phase (F_{(2, 9)} = 0.068, P = 0.935 for control group, F_(2,12) = 0.283, P = 0.759 for group I). (D) The preference scores of group I during the 12.25 month-CPP phase (F_{(2, 12)} = 0.118, P = 0.890).