Fig. 2

Scalp EEG recording of the present case. a Interictal EEG showed 5–6 Hz intermittent slow-wave background activity. b Ictal EEG showed low-voltage fast waves without clear focal features, followed by frontal dominant rhythmic multiple spikes in the average montage. c Ictal EEG showed diffuse low-amplitude fast waves in double banana montage. Red waves show the electrocardiogram signal, green waves and blue waves show the electromyography signal. The onset and end of the seizures are marked by yellow vertical lines. The red vertical lines represent the position corresponding to monitoring video playback and EEG. (Sensitivity at 10 µV/mm, LFF at 0.5 Hz, and HFF at 70 Hz)