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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: Behav Brain Res. 2012 Jun 18;234(1):100–106. doi: 10.1016/j.bbr.2012.06.010

Figure 1.

Figure 1

Time course of cocaine-cue extinction learning in animals previously trained to self-administer cocaine (COC EXT) or receiving yoked-saline (SAL EXT) under a second-order schedule of reinforcement. Mean ± SEM values are expressed as the percentage of cocaine self-administration baseline responses (per 30min) for each group. Sequential 30min bins over the 2hr extinction training session were examined. * p<0.05 compared to the first 30min of extinction training.