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. Author manuscript; available in PMC: 2020 Mar 6.
Published in final edited form as: Drug Alcohol Depend. 2018 May 25;188:318–327. doi: 10.1016/j.drugalcdep.2018.04.018

Fig. 2.

Fig. 2.

Top Panel: Number of self-administered cocaine doses as a function of d-amphetamine dose in 5 female rhesus monkeys. Responding was maintained under a Fixed interval 1 min; Fixed ratio 10 chain schedule [FI 1-min (FR10:S)] with a maximum of 15 drug infusions.

Bottom Panel: Number of food pellets earned as a function of d-amphetamine dose in 5 female rhesus monkeys. Responding was maintained under a Fixed interval 1 min; Fixed ratio 10 chain schedule [FI 1-min (FR10:S)] with a maximum of 80 food pellets (8 trials for 10-pellets each). The food pellet session occurred 2 h after completion of the cocaine session.