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. 2015 Sep 1;9:230. doi: 10.3389/fnbeh.2015.00230

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Copyright © 2015 Matsumoto, Matsumoto, Wakuda, Ichihara and Mizunami.

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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Differential appetitive olfactory conditioning of MER with water US. (A) Acquisition performance. Percentages of MER to the odor paired with water (paired odor: black graph) and the odor presented alone (unpaired odor; gray graph) are shown. Animals were subjected to five pairing trials to associate an odor with water and to presentation of another odor without pairing with the US with 5-min intervals. The number of animals tested is shown in parentheses. (B) Retention performance at 1 day after conditioning. Percentages of MERs to the paired odor (black bar) and those to the unpaired odor (white bar) are shown. The %MER to the paired odor was significantly higher than that to the unpaired odor. ^**p < 0.01; ^***p < 0.001.