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. Author manuscript; available in PMC: 2019 Dec 5.
Published in final edited form as: Eur J Pharmacol. 2018 Sep 27;840:28–32. doi: 10.1016/j.ejphar.2018.09.025

Fig. 2.

Fig. 2.

Demand curves for IV heroin (3.2 μg/kg, left panel; 10 μg/kg, middle panel) and 1-g banana-flavored food pellets (right panel) alone (grey symbols) and during repeated administration of 1.0 mg/kg lorcaserin (open symbols). Each data point represents the mean number of heroin injections and food pellet reinforcers earned as a function of price. Lines represent the best fit for each data set determined using the exponential model of demand (Hursh and Silberberg, 2008).