Fig. 8.

“Barrier hits” responses of 3NP-treated baboons and control animals according to the level of difficulty in the ORDT. The percentage of barrier hits responses are represented for easier front-reach trials (open side of the box directly facing the animal) and for difficult trials (transparent side of the box interposing the reward with the animal). Black barsrepresent control animals. Cross-hatched bars represent 3NP-treated animals. Values are mean ± SEM. Statistical analysis was carried out using factorial ANOVA and post hoc analysis using Scheffe’s F test to determine significant interactions between groups. 3NP-treated animals seemed significantly different from controls in the difficult but not the easy trials.