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. 2012 Mar 28;37(8):1901–1910. doi: 10.1038/npp.2012.37

Figure 2.

Figure 2

Average intake and responses during the 2-week test period. Panel (a) shows the daily intake self-administered for each day over the 14-day test period for each group. Each symbol represents the mean intake self-administered for that group (±SEM). Panel (b) shows the average (±SEM) intake per session for each group. LgA animals self-administered significantly more cocaine than all other groups (p<0.001). Panel (c) shows the responses per session for each group. Bar represents the mean (±SEM) number of responses per session. The TH, HD, and IntA-HD groups responded significantly more than ShA animals (*p<0.05), and both TH and HD groups responded more than the IntA-FR group (†p<0.05).