Fig. 5.

Experiment 1. The number of lever presses and chain pulls (i.e., actions) per minute during the choice reward test conducted after one of the training outcomes was devalued by a specific satiety treatment. In contrast to the extinction test, performance of lever-press and chain-pull actions delivered the training outcomes on independent random ratio schedules. Data from the reward test are presented for group sham (left) and group GC (right) averaged across 2 min periods with performance of the action that previously delivered the pre-fed, i.e., devalued (Deval), outcome (filled circles) presented separately from performance of the action that had delivered the non-pre-fed, i.e., valued (Val), outcome (open circles) for each group.