Diagnostic criteria: Age of onset between 4 and 10, with peak age of onset between 5 and 7 years. Normal neurological examination and normal intellectual development. Sudden and abrupt disturbance of consciousness (4-20 seconds, more than 20 seconds is rare) with frequent episodes, tens of episodes per day. Automaticity is common but not meaningful for diagnosis. The EEG during seizures shows 3 Hz spikes and slow waves in all leads. The duration is 4 -20 seconds. Exclusion criteria: The presence of other seizure types, such as GTCS, or myoclonic seizures that precede the akathisia. Blepharospasm, perioral spasm, generalized rhythmic muscle clonus, single or rhythmic myoclonus of the head or trunk. Mild impairment of consciousness. Brief 3- to 4-Hz spikes of less than 4 seconds, multiple spikes, and fragmented discharges during seizures. Clinical seizures can be triggered by light stimulation or other sensations.