FIG. 2.

Rats were trained on operant attentional set-shifting tasks (oAST), before surgery and group assignment, for at least 17 days to achieve performance baseline stability (i.e., three consecutive days with <10% variability) as seen via total trials to criterion, total errors, and perseverative errors (daily sets 2–4), which were summed for each rat. Data are expressed as mean (± standard error of the mean). No statistical analyses were necessary prior to group designations, N = 32.