Fig. 8.

Experiment 3. Performance of lever-press and chain-pull actions averaged across 4 min periods in the choice extinction test conducted after a post-training reduction in food deprivation. Before this test, all of the rats were allowed to learn about the effect of the shift in food deprivation on the incentive value of one of the two food outcomes used in training by giving them brief consummatory contact with that outcome in the new, i.e., low deprivation, state. The effect of this treatment on choice performance in extinction is presented for group sham (left) and group GC (right) with the performance of the action that, in training, delivered the outcome re-exposed in the low deprivation state (i.e., Deval, filled circles) plotted separately from performance of the other action (i.e., Val, open circles) in each group.