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. Author manuscript; available in PMC: 2021 Mar 1.
Published in final edited form as: Drug Alcohol Depend. 2020 Jan 17;208:107848. doi: 10.1016/j.drugalcdep.2020.107848

Figure 1.

Figure 1.

Effects of 7-day saline substitution on choice between heroin and food in female rhesus monkeys (n=6). Top and bottom abscissae: unit dose of heroin in milligrams per kilogram per injection or heroin-associated stimuli. Top ordinate (A): percent choice of heroin or heroin-associated stimuli. Bottom ordinate (B): number of choices completed per component. Points represent mean ±SEM obtained during days 5–7 of each 7-day treatment period. Filled symbols denote significantly different from baseline (p<0.05).