Lesioned rats show increased discounting behavior in the delay discounting task.

<p>Sham control (n = 9) and lesioned (n = 6) rats were tested once-daily in single session delays until stable behavior was observed (< 20% variability) upon which they were incremented to the next delay in ascending order. These rats include those which completed the entire task with the same history of delay presentation. Shown is the free-choice ratio (i.e., the number of selections made for LR/SR divided by total selections x 100). <b>(A)</b> Both groups exhibited preference for the LR when the imposed delay was small but lesioned rats progressively decreased preference for the LR when the delay was increased. <b>(B)</b> Choice of the SR increased as delay length was increased. <b>(C)</b> Rats exhibited low omissions throughout the delays tested in the discounting paradigm. Shown are the percent omissions (# omissions averaged for free-choice trials divided by total trial # x 100). Data are presented as mean + SEM (two way rmANOVA; <i>post hoc</i> Newman-Keuls, * p<0.05).