A seizure that does not involve the entire brain. The epileptic neurons at a focus begin to discharge together in bursts, and it is this synchronous bursting of neurons that produces epileptic spiking in the EEG. The specific behavioral symptoms of a focal epileptic seizure depend on where the disruptive discharges begin and into what structures they spread. they are not usually accompanied by a total loss of consciousness or equilibrium. There are two major categories: simple partial seizures and complex partial seizures.