Effects of augmented GABAergic inhibition on ECS-induced enhancement of dopaminergic modulation. A and B: diazepam (Dzp; 5 mg/kg per day) attenuates effects of ECS on the dopamine-induced synaptic potentiation assessed 24 h (A) and 2 wk (B) after the last ECS [Bonferroni's test: **P < 0.01, ***P < 0.001; 2-way ANOVA: interaction (drug treatment × ECS), F(1,16) = 5.16, #P = 0.0373 for 24 h and F(1,16) = 19.62, ###P = 0.0004 for 2 wk]. Veh, vehicle. C: effects of Dzp (5 mg/kg per day) applied during the period of ECS on lasting enhancement of dopaminergic modulation (***P < 0.0001). D: effects of Dzp (10 mg/kg per day) applied after ECS on lasting enhancement of dopaminergic modulation [interaction (drug treatment × ECS), F(1,32) = 0.8402, P = 0.3662].