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. 2016 Oct 10;7:169. doi: 10.3389/fpsyt.2016.00169

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Copyright © 2016 Corbit and Janak.

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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Pavlovian–instrumental transfer is greater following extended sucrose self-administration. (A) Mean magazine entries (+SEM) during the pre-CS (baseline) period and presentations of the CS+ and CS− across days of Pavlovian training for the 2- and 8-week training groups. (B) Mean lever presses (+SEM) during the pre-CS (baseline) period and presentations of the CS+ and CS− during the Pavlovian–instrumental transfer test. The excitatory effects of the CS+ are greater for the 8-week group. *indicates responding during the CS+ is greater than during the baseline period, p < 0.05. **indicates responding is greater for the 8-week group than for the 2-week group, p < 0.05.