*6.3.2 Interictal abnormalities*

In wakefulness there may be no epileptiform discharges. If this is present, generalized spike-waves discharges are at 2–3 Hz, predominant over the frontalcentral areas. They may show not consistent asymmetries between the hemispheres. Focal or multifocal spikes may also be present; these are rarely abundant and may predominate on one side, but not consistently so, and are not associated with focal slowing [11]. During sleeping, focal and generalized spike-wave discharges may increase and acquire a typical polyspike component.
