Primary Epilepsy (PE)
Primary experimental epilepsy
Primary generalized epilepsy refers to seizures which start as a generalized seizure. A generalized seizure is one which involves the whole brain, including both hemispheres. If it is a primarily generalized seizure, an electroencephalogram (EEG) of the brain shows seizure activity which involves all parts of the brain simultaneously. While some of these seizures truly seem to start in all areas simultaneously, some may arise from a single focus but spread to generalize so quickly the initial originating location cannot easily be seen on a simple EEG. A primarily generalized seizure is distinct from focal seizures which generally present as a partial seizure. A partial seizure affects only part of the brain on one side.