PMC4308027_01
A: EEG showing a focal flattening in bilateral central electrodes.. B: Delayed ictal focal theta (4 c/s) rhythmic activity in bilateral central electrodes.. C: EEG showing interictal spikes in the left and midline frontocentral electrodes.
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Ictal EEG revealed very discrete abnormalities in all seizures visible 1 to 3 s before the clinical onset and characterized by a generalized flattening, sometimes predominating in the midline frontocentral electrodes (Fz, Cz) followed by a focal theta (4 c/s) rhythmic activity lasting several seconds in the same electrodes (Figs. 1A and B). Interictal spikes were rarely observed in the left and midline frontal electrodes (F3, Fz) (Fig. 1C).