Effects of PRA on the performance of 5-CSRTT. The graphs showed the effects of different dosage of PRA (0, 0.1 and 0.3 mg/kg) on the performance of 5-CSRTT (N = 11) in the aspects of correct response rate (A), premature response (B), omission rate (C), correct latency (D) and magazine latency (E). Open bars depicted saline vehicle controls, oblique lattice bars depicted PRA at 0.1 mg/kg, and black bars depicted PRA at 0.3 mg/kg. Values are presented as mean+SEM. * P < 0.05.