Fig. 4.

Suppression of PR performance following systemic sulpiride administration with a 40-min injection-behavioural test interval. a Breakpoint values of C57Bl/6 mice (n = 18) administered 25 or 50 mg/kg sulpiride. b–c Reward collection latency and post-reinforcement pause are unaffected by sulpiride administration. d–f Differential effects of sulpiride on the rates of IR beam breaks in the behavioural arena and magazine. g Effects of sulpiride on the rate of responding at non-target touchscreen locations. h Sulpiride has no effect on total response time. i Sulpiride has no effect on inter-response interval. (*p < 0.05; ns not significant)