Fig. 2: Experiment 2 results.
From: Demand for heroin in rats: effects of non-drug alternative substitutes and complements
a Demand curves fit to the combined-sexes group mean consumption of heroin infusions (IHS transformed) across the prices for heroin on the right lever. The dotted vertical line represents the FR-6 price for saccharin reinforcers always available to rats in the Heroin with Saccharin group. b Demand curves fit to group mean heroin consumption in female rats only. *p < 0.05, main effect of Group. c Demand curves fit to the group mean heroin consumption in male rats only. d Mean (±SEM) essential value for the female and male rats in each group. *p < 0.05, significant Group X Sex interaction. e Mean (±SEM) heroin Q0. *p < 0.05, for main effect of Group.
