Figure 3.

Effects of 6-OHDA lesions in the AC on sound sequence discrimination learning. (A) Immunohistochemical staining of tyrosine hyroxylase in the AC of a control rat (left) and a rat injected with 6-OHDA into the AC (right). (B) Bilateral 6-OHDA lesions in the AC attenuated sound sequence discrimination (*P < 0.05, repeated measures ANOVA with post hoc Scheffe’s test). (C) Total number of trials with licking during the test sessions was not attenuated by the 6-OHDA lesions. (D) 6-OHDA lesions had no significant effect on discrimination between the PT and AM. (E) 6-OHDA lesions had no effect on discrimination learning between AMs with modulation depths of 70% and 30%.