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. Author manuscript; available in PMC: 2010 Jun 22.
Published in final edited form as: Nature. 2001 Jul 12;412(6843):141–142. doi: 10.1038/35084134

Figure 1.

Figure 1

Persistence of a cocaine-seeking habit as a function of time since the last day of self-administration of cocaine. a, Mean (±standard error) number of non-reinforced responses on the lever previously associated with cocaine, from six extinction sessions in the presence of the house light and lever cues that were previously associated with cocaine availability. b, Mean (±standard error) number of non-reinforced responses on the lever previously associated with cocaine in the subsequent presence of the light–tone signal (conditioned reinforcer) that was previously associated with earned cocaine injections. Baseline data are from the previous extinction session. *Different from day 1 (P<0.01).