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. 2015 Jul 22;41(2):646–657. doi: 10.1038/npp.2015.195

Figure 2.

Figure 2

Choice between saccharin and heroin or cocaine in the continuous choice setting: representative individuals. Each graph represents a single session. Each vertical bar above or below the gray horizontal line corresponds to the delivery of a sweet or drug reward, respectively. Each alphanumeric code above each distribution corresponds to an individual rat. (a) Within-session distribution of saccharin (0.2%) and heroin (0.01 mg per injection) rewards during the first session of continuous choice in three representative rats S/H. (b) Within-session distribution of heroin rewards during the last FR training session in the same individual rats as in (a). (c) Within-session distribution of saccharin and cocaine (0.25 mg per injection) rewards during the first session of continuous choice in three representative rats S/C. (d) Within-session distribution of cocaine rewards during the last FR training session in the same individual rats as in (c). (e) Within-session distribution of saccharin rewards in three representative rats S/0.