Epilepsy Diagnosis Logo



The EEG background may be normal at onset, progressive slowing of the background occurs over time. Interictal EEG findings may vary depending on the underlying etiology.


A single generalized polyspike-and-wave may correlate with the myoclonic seizure, or there may be variable ictal EEG findings.

With generalized tonic-clonic seizures, the ictal EEG is often obscured by artifact. Generalized fast rhythmic spikes are seen in the tonic stage. Bursts of spikes and after-coming slow waves are synchronous with clonic jerks. A postictal period of irregular slow activity follows.

Feedback | Home | Contact Us | Privacy | Terms & Conditions of Use | Log In For Videos
Creative Commons License
This website is owned by the International League Against Epilepsy. Text on this website, last updated July 15, 2022,
is available under a Creative Commons Attribution-ShareAlike 4.0 International License,
EXCEPTING all videos and images, which remain copyrighted by the International League Against Epilepsy.