Figure 2.

No differences in cocaine self-administration across groups tested at different withdrawal time points. A, B, No group differences (for animals destined for the nine groups shown in Fig. 3) were observed in average (days 1–10, A) or daily (B) active hole responding, infusions obtained, or inactive hole responding (as described in Fig. 1) during cocaine self-administration, indicating that group differences in incubated cocaine-seeking behavior (Fig. 3) were not because of differences in cocaine intake or self-administration behavior.