Vomiting occurred mainly when the ictal discharges were more diffuse than localized.

The onset of the electrical ictal discharge was mainly occipital (7 cases) or frontal (7 cases)and consisted of rhythmic monomorphic decelerating theta or delta activity with small spikes.

Indeed, recently Köhling et al. reported that under epileptogenic condition (free Mg 2+in ACSF), γ band oscillations arise from GABAergic depolarizations and that this activity may lead to the generation of ictal discharges [ 18 ] .