(A) EEG of a 75 year old woman with adult onset myoclonic epilepsy (see text, case 1), showing generalised spike and wave and polyspike and wave discharges with bifrontal predominance. (A) EEG of a 75 year old woman with adult onset myoclonic epilepsy (see text, case 1), showing generalised spike and wave and polyspike and wave discharges with bifrontal predominance. (B) EEG of a 69 year old man with adult onset tonic–clonic epilepsy alone (see text, case 1) showing generalised spike and wave discharge with bifrontal predominance. C Marini et al. J Neurol Neurosurg Psychiatry 2003;74:192-196 ©2003 by BMJ Publishing Group Ltd