Ictal EEG shows rhythmic seizure activity with frequency that increases from 3 to 5 Hz, mainly at F8, T4, and T6. During this activity, the patient experiences fear which is absent before and after.
(A) Onset of a tonic seizure in Patient 2. (B) Ictal EEG of Patient 2 showing ample muscle artefacts and seizure onset with rhythmic activity that starts with a maximum at P3.
Ictal EEG of Patient 3 showing rhythmic slow-wave activity at F3/Fz > Fp1 (10 s/page; 7 μV/mm; low-pass: 50 Hz); the patient demonstrates her habitual ictal urge to look for written characters and then stares for around 25 seconds.