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. 2019 Feb 26;13:8. doi: 10.3389/fnbeh.2019.00008

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Copyright © 2019 Bye and McDonald.

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) and the copyright owner(s) 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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(A) Mass training for Experiment 3 after being pre-trained in room A. Same rats were mass trained in room A, New and New + CPP rats were mass trained in room B. Two trial averages of the latency in seconds to find the new platform over training 2 h/16 trials. Same and New rats learned whereas New + CPP rats failed to learn over the course of training. (B) Hippocampal cell counts of Arc positive cells in the dentate gyrus, CA1, and CA3, 70–80 min after trial 8 of massed training in Experiment 3. New rats displayed the significantly more Arc in the dentate gyrus than any other group. CPP significantly reduced the expression of Arc in the dentate gyrus in rats mass trained in the room B. (C) Dorsal and ventral hippocampal cannulation locations for the CPP rats of group 2 in Experiment 2. Error bars 1 ± SE. ^∗p < 0.05.