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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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Experiment 1: Phase IV: Performance during lever autoshaping procedure (Sign-tracking screening procedure). Data are mean ± SEM on three different lever-directed (left) and food cup-directed (right) measures. Number of lever and food cup contacts (top row), latency to contact lever or food cup (middle row) and probability of contacting lever or food cup (bottom row).