Diagnosis can be made definitively by Electroencephalography (EEG), which records the electrical activity of the brain. This is typically done after a seizure episode in a<unk> al setting with an attempt to "capture" a seizure while it happens. According to "Harrisons Manual of Medicine," the EEG during the<unk>  phase will show a "progressive increase in low-voltage fast wave activity, followed by<unk>  high-amplitude, poly spike discharges." The<unk>  phase EEG will show "high amplitude activity that is typically interrupted by slow waves to create a spike-and-slow-wave pattern." Additionally, the postictal phase will show suppression of all brain activity, then slowing that gradually recovers as the patient awakens.
Generalized tonic–clonic seizure
Reflex seizure
Intercalated seizure
Absence seizure
Focal seizure
Atonic seizure
Status epilepticus
Febrile seizure