Effects of 5, 20, and 40 mg/kg OV329 injected intraperitoneally on the thresholds of the ivPTZ-induced (A) first myoclonic twitch and (B) first clonic seizure in rats (n = 8). Treatment effects were further calculated as percent change to the basal seizure threshold for the myoclonic twitch (C) and the clonic seizure (D). Data are expressed as mean+SEM. Statistically significant differences between OV329 and the basal seizure threshold (A, B), and between OV329 and saline as vehicle control (C, D) are indicated by asterisks (one-way mixed-effects model analysis, post-hoc Sidak correction, **P<0.01, ***P<0.001).