Please refer to specific syndromes and etiologies in which this seizure type occurs.
Generalized spike-and-wave is mandatory. Regular 3 Hz generalized spike-and-wave occurs with typical absence seizures in childhood absence epilepsy. In absence seizures beginning in adolescence, faster irregular 3.5-6 Hz generalized spike-and-wave and polyspike-and-wave occurs.
CAUTION Slow spike-and-wave (<2.5Hz) consider atypical absence seizures
Example of 3Hz generalized spike-and-wave seen on the ictal EEG