(A, B) Interictal EEG of the patient showing fronto-centrally dominant, generalized, high-amplitude spike-and-slow-wave discharge.
(A, B) Pattern 1 (P1): EEG during perioral myoclonus, showing fronto-centrally prominent, generalized, 3-4-Hz spikes/multiple spikes-and-slow-wave discharges.
Pattern 2 (P2): EEG during a perioral “chapeau de gendarme” seizure, showing trains of generalized, 10-12-Hz sharp-wave activity.