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Effects of Ro-63–1908 on probability discounting performance. Mean (± SEM) raw proportion of responses for the large, probabilistic reinforcer for rats trained in the ascending (a) and descending (b) schedules. Mean (± SEM) AUC values for rats trained in the ascending (c) and descending (d) schedules. *p < .05, relative to vehicle. n =12 each dose and each schedule.
