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. 2011 Oct 19;6(10):e26481. doi: 10.1371/journal.pone.0026481

Figure 5. In Experiment 2, there were no differences in the amount of cocaine exposure, cocaine-cue exposure, or the number of days to reach each ratio/infusion criterion between the 5- and 90-s groups.

Figure 5

Total drug intake (panel A), number of cue-cocaine pairings (panel B) and days to reach ratio/infusion criteria (panel C) in the 5- and 90-s groups. Rats were required to meet the FR 1 and FR 2 criteria as well as infusion criteria 10–15 for 2 days each, and to meet infusion criterion 20 for 21 days. Values are mean ± SEM. n's = 6–7/group. s, seconds. CS, conditioned stimulus; UCS; unconditioned stimulus. FR; fixed ratio.