Does BRV Have Faster Onset Time & Greater Effect Than LEV in Epilepsy Pts Using PPR Pharmacodynamic Efficacy Endpoint

Inclusion Criteria: * Patients between 18 and 65 years of age * Male or female * PPR at minimum at 60,50,40,30,25,20,18 or 16 Hz as upper threshold * Drug naïve or at most with up to 4 AEDs, not being LEV or BRV Exclusion Criteria: * Current treatment with more than 4 AEDs * LEV or BRV as current treatment or used in the previous month. * History of severe side-effects or psychological side-effects with LEV or BRV use * Being pregnant or insufficiently protected against pregnancy (see also ref 31) or lactating Female * Serious internal medical disease (renal/hepatic/cardiovascular disease) as deemed by the on-site physician (WER) * History of psychiatric disease that has been a reason for acute hospitalisation for their condition of depression, schizophrenia, mania, delirium or aggressive behaviour * History of status epilepticus * History of significant ethanol or illicit drug use