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Figure 5: Subdural intracranial EEG-(iEEG) recorded frontal lobe onset seizure. Referential montage iEEG from 6 × 6 (36-contact) subdural grid (contacts 35 and 36 removed because of not recording) and a 1 × 8 (8 contact) subdural strip. Gamma frequency oscillation at seizure onset (red box) primarily involving contacts 21, 22, and 23 with early spread to contacts 12, 13, 28, 29, and 30.