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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2008 Jun 9;98(1-2):54–62. doi: 10.1016/j.drugalcdep.2008.04.009

Figure 1.

Figure 1

Locomotor activity (distance, in cm) after the first (Test 1) and second (Retest) injection with 10 mg/kg cocaine. The retest occurred following the conclusion of the operant behavior phase of the study, with ∼ 3 months separating the two tests. Shown is a scatter plot of the cumulative locomotor activity (mean shown as a horizontal line) for the 30-min following i.p. injection. The response during Test 1 was used to classify rats as LCRs or HCRs (n = 8/group). ### p < 0.001, compared to HCRs at Test1; ** p < 0.01, Test 1 compared to Retest within HCRs