<qa>  What is the name of the drug that will be assigned to each of two groups?Design. Subjects will be assigned to either of two groups, with each group receiving one of the following drugs; carbamazepine CBZ, and lamotrigine LTG. Measures of cortical excitability will be performed using TMS in various drug treatment phases: at baseline before drug intake; during the AED induction period once a day for the first 5 days, after 12 days of drug intake at the maximum dose during steady state; and 3, 7, and 14 half-lives after, and finally three weeks after abrupt drug withdrawal. Blood sampling for drug levels will be performed at each TMS study. 