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Epilepsy surgery conceptually relies on the identification of the so-called epileptogenic zone [1]. However, in up to 25-50 % [2] of candidates for epilepsy surgery, questions remain as to the extent of the resection (or disconnection) necessary and or sometimes simply laterality. Such patients usually undergo invasive monitoring, i.e. placement of intracerebral depth and/or subdural strip or grid electrodes for intracranial EEG recordings, with grid electrodes providing the additional opportunity for eloquent cortex mapping.