Using Micro-filaments to Detect "fast Ripples" and Improve the Identification of the Epileptogenic Zone

Inclusion Criteria: * inclusion criteria is determined based on the clinical diagnosis of the refractory epilepsy and the admissibility of the patient for the stereoelectroencephalography (sEEG) procedure Exclusion Criteria: * severe psychiatric disorders, * severe agitation during their crisis * contraindication for performing an MRI: claustrophobia, a cardiac or neural stimulator, ferromagnetic surgical clips, cochlear implants, intraocular metallic foreign body or in the nervous system, * contraindication to intracerebral investigation (macro-electrodes): ongoing infection, severe associated pathology (cardiac, pulmonary, renal, hepatic), pregnant or nursing women, * anti thrombotic ongoing treatment.