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. Author manuscript; available in PMC: 2020 Dec 4.
Published in final edited form as: Neuropharmacology. 2019 Mar 21;153:142–152. doi: 10.1016/j.neuropharm.2019.03.025

Figure 1.

Figure 1.

Example session from a single subject under the uncontrolled reinforcer frequency schedule. (A) A trial-by-trial (rows) and block-by-block (columns) breakdown during an uncontrolled reinforcer frequency session, where the left lever is associated with food and the right lever is associated with drug. Within each choice trial, both reinforcers are available and a check mark over the food/drug label represents choice made (i.e., FR5 completion) by the animal. (B) Graphical representation of the number of reinforcers earned across blocks as a function of dose. (C) Graphical representation of the percent choice for cocaine as a function of dose.