Figure 1.
Effects of corticosterone/yohimbine (3 mg/kg, each, i.p.) (n = 11) or vehicle (n = 11) applied prior to the two-lever choice tests on lever preference (Experiment 1). Response rates for the lever that delivered valued and devalued outcomes on test days 1 and 2 are shown. On both test days, the outcomes (pellets vs. sucrose) were devaluated in a counterbalanced manner. On days 1 and 2, respectively, there was a significant devaluation effect, but no outcome devaluation × treatment interaction.
