Fig. 3. Behavioral score after pharmacologic modulation of the nucleus basalis of Meynert in all experiments. A significant effect on group mean score was observed with norepinephrine (n = 11) but not with artificial cerebrospinal fluid (n = 10) infusion. Please note that one animal failed to complete both treatment groups because of euthanasia due to removal of the skullcap. *P < 0.05 versus  zero. Error bars ± 1 SD; n = number of rats. aCSF = artificial cerebrospinal fluid.