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. Author manuscript; available in PMC: 2018 Mar 1.
Published in final edited form as: Neuropharmacology. 2016 Nov 23;114:77–87. doi: 10.1016/j.neuropharm.2016.11.014

Table 1.

Probabilistic discounting and training acquisition criteria.

Experimental phases Acquisition criteria Sessions to reach criteria
Phase 1. Acclimation >90% food pellet retrieval 1 session
Phase 2. Fixed-ratio reinforcement: center lever (FR1 – FR5) >85% of animals completed 50 trials successfully for two consecutive sessions 5 sessions
Phase 3. Discrete trials: Side lever press training >85% of animals completed 50 trials successfully for two consecutive sessions 3 sessions
Phase 4. Probabilistic lever training >85% of animals select the probabilistic lever on >85% of free-choice trials for two consecutive sessions 6–8 sessions
Phase 5. Probabilistic discounting task Baseline stability as a group. Assessed by one-way ANOVA for repeated measures (RP and day) as independent factors 17–21 sessions