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. 2014 Jul 3;8:229. doi: 10.3389/fnbeh.2014.00229

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Copyright © 2014 Torquet, Aimé, Messaoudi, Garcia, Ey, Gervais, Julliard and Ravel.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or 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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Experiment 1: Tests for conditioned odor preference induced in the two groups of rats after conditioning and one month later. (A) Learning curve and test followed by long-term memory test (LTM test) performances for the two groups pooled (n = 16). During the conditioning period, the CS+ odor was associated with the sucrose solution and the CS- with plain water. Before and after conditioning (pretest and tests), both odors were associated with plain water. (B) Odor preference for each group (left panel: group 1 conditioned for G+ over E−; right panel: group 2 conditioned for E+ over G−; n = 8 for each group). Data are presented as means of ratio (number of licks for the bottle on the sum of the number of licks for the two bottles) + s.e.m. over the two consecutive pretest/test days (Wilcoxon tests; ^*p < 0.05; ^**p < 0.01; ^***p < 0.001).