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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Tob Regul Sci. 2016 Oct;2(4):329–342. doi: 10.18001/TRS.2.4.5

Figure 1. Mean Responding on the Active and Inactive Levers During the Acquisition Phase of Experiment 1.

Figure 1

Note. Mean (± SEM) responses on the active and inactive lever in each group of adolescent and adult rats across the last three session under the FR 1 schedule in Experiment 1. Different from saline, +p < .05, +++p < .001. Different from inactive lever, ***p < .001.