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. Author manuscript; available in PMC: 2016 May 15.
Published in final edited form as: Biol Psychiatry. 2014 Nov 27;77(10):912–920. doi: 10.1016/j.biopsych.2014.11.017

Figure 4. Sucrose and heroin self-administration: extended access procedure (Experiment 2).

Figure 4

Number of reinforcements (triangles, left) and responses on the active (filled circles, right) and inactive (open circles, right) lever during sucrose (a, n=10) and heroin (b, n=13) 12 hr self-administration. Error bars = SEM.