Transcranial Direct Current Electrical Stimulation (tDCS) in Drug-resistant Epilepsy

Inclusion Criteria: * \- Age: Older than 12 years old * Patients with drug-resistant focal epilepsy with no surgical indication or with a previous surgical failure or refusing surgery. * SEEG previously performed before inclusion with an adequate definition of the epileptogenic zone * A clinical or research MRI scan that is suitable for navigated brain stimulation (NBS) and definition of target area. * Number of seizures \>3/month during the baseline (before the first session of tDCS treatment), for at least 3 months * Have stable medications for the whole study duration and few weeks before * Total IQ\>65 * Be able to understand, speak and write in French * Patient, parents or legally representative who have given written informed consent to allow the study data collection procedures, * Be a beneficiary of affiliated to a health insurance plan Exclusion Criteria: * \- Generalized epilepsy * Presenting contraindication to MRI, a serious intercurrent pathology, a progressive brain tumor * Skin conditions (e.g., eczema, lesion) * Any cranial metal implants (excluding \<1 mm thick epicranial titanium skull plates and dental fillings) or medical devices (i.e. cardiac pacemaker, deep brain stimulator, medication infusion pump, cochlear implant). * Previous surgeries opening the skull leaving skull defects capable of allowing the insertion of a cylinder with a radius greater or equal to 5 mm. * Metal inside the head (outside the mouth) such as shrapnel, surgical clips * Patient currently participating in another clinical trial or having participated in a clinical trial in the month prior to inclusion. * Any condition that makes the study subject, in the opinion of the investigator, unsuitable for the study. * Person protected by articles L1121-5, L1121-6 and L1121-8 of Public Health Code (pregnant or breastfeeding woman, deprived of liberty by judicial decision, situations of social fragility, adults unable or unable to express their consent).