Fig. 3: Experiment 2 results continued.
From: Demand for heroin in rats: effects of non-drug alternative substitutes and complements
a Mean (± SEM) consumption of saccharin reinforcers (IHS transformed) obtained by pressing the left lever as a function of the price of heroin on the right lever for female (circles) and male (triangles) rats in the Heroin with Saccharin group. The dotted vertical line represents the FR-6 price for saccharin reinforcers in the Heroin with Saccharin group. b Mean (±SEM) of the slopes of the linear regression best fit lines relating log saccharin consumption to log price of heroin on the right lever in the Heroin with Saccharin group. Circles and triangles represent individual female and male rats, respectively. The dashed horizontal line at 0.2 represents the threshold for substitution. **p < 0.01.
