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Preictal surrender of post–spike slow waves to spike‐related high‐frequency oscillations (80–200 Hz) is associated with seizure initiation

Spike and slow waves consist of a “spike” including high‐frequency oscillations (HFOs), which are linked to epileptogenicity and a “post–spike slow wave (PSS)” related to inhibitory activity. The aim of this study was to elucidate the spatiotemporal relationship between spike‐related HFOs and PSS in patients with focal cortical dysplasia (FCD) type II.