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. 2015 Nov 3;9:289. doi: 10.3389/fnbeh.2015.00289

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Copyright © 2015 Nasser, Chen, Fiscella and Calu.

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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Exp 2: Phase III: Overall performance during second-order probe test. (A) Number of food cup entries (mean ± SEM) during the last 5 s of the 10 s Pre-CS and CS for the light first-order cue (FOC; CS+, or CS−; left panel) and auditory second-order cues (SOC; SOCS+ or SOCS−; right panel). (B) Percent time spent rearing (mean ± SEM) during the first 5 s of the 10 s Pre-CS and CS for the light first-order cues (FOC; CS+ or CS−; left panel) and the total 10 s for the auditory second-order cues (SOC; SOCS+ or SOCS−; right panel). (C) Percent time spent head jerking (mean ± SEM) during the total 10 s Pre-CS and CS for the light first-order cues (FOC; CS+ or CS−; left panel) and the total 10 s for the auditory second-order cues (SOC; SOCS+ or SOCS−; right panel). ^*Different in responding between pre-CS and CS, p < 0.05.