Fig. 2.

Intra-PFC THC treatment does not affect attentional set-shifting. a The number of trials needed to set-shift from visual to response strategy or the number of errors (b) was not affected with THC treatment. Subcategorization of errors revealed that the number of perseverative errors (c) or never-reinforced errors (e) was unchanged relative to VEH control. The number of regressive errors (d) in THC₁₀ group was significantly lower than in the VEH control. Subscript numbering indicates drug concentrations in ng/hemisphere. Black circles indicate data points (not shown in e for clarity). Data represent mean ± s.e.m. Group sizes (n): VEH (9), THC₁₀ (7), THC₅₀ (10), THC₁₀₀ (7), THC₅₀₀ (7). Respective treatment groups were compared with one-way ANOVA followed with Gabriel post-hoc or Kruskal–Wallis test followed with Mann–Whitney U tests. *p < 0.05 vs. VEH group