Helium 4 Optically Pumped Magnetometers : a New Generation of Sensors for High Speed Functional Brain Imaging

Inclusion Criteria: Volunteers: * Age 18+ * Right handed * Medical insurance * Strongly motivated to participate to the study * Signed informed consent for the study * No previous neurology or psychiatric pathologies * No major cognitive deficit and able to understand the instructions Patients: * Age 18+ * Right handed * Medical insurance * Strongly motivated to participate to the study * Signed informed consent for the study * No previous neurology or psychiatric pathologies (except epilepsy) * Epilepsy evolving during at least two years * No major cognitive deficit and able to understand the instructions Exclusion Criteria: Volunteers: * Age \< 18 years or \> 60 * previous neurology or psychiatric pathologies * Child bearing women * Subject having one of the following mettalic parts : * (pacemaker, implentable pump, neurosimulator, chochlear implant, auditory prothesis, mettalic prothesis, intracerebral clip, implantable defibrilator, any mettalic parts in the brain or upper part of the body, ventriculoperitoneal valve) * Claustrophobia Woman with a positive pregnancy test during the inclusion. Patients: Age \< 18 years or \> 60 * previous neurology or psychiatric pathologies except epilepsy * Child bearing women * Subject having one of the following mettalic parts : * (pacemaker, implentable pump, neurosimulator, chochlear implant, auditory prothesis, mettalic prothesis, intracerebral clip, implantable defibrilator, any mettalic parts in the brain or upper part of the body, ventriculoperitoneal valve) * Claustrophobia Woman with a positive pregnancy test during the inclusion.