Fig. 3.

Percent larger reinforcer choice as a function of block in session (corresponding to the increasing delay to the larger reinforcer across successive blocks) across all MEC-NIC drug dose combinations during experiment 2 for LEW (left panel) and F344 (right panel) rats. Note that data for each rat strain are collapsed across delay series. Error bars represent standard error of the mean. Statistically significant differences are not indicated to facilitate clarity of the figure—see text for a description of significant pairwise comparisons