A New Generation of Magnetoencephalographs for High Speed Functional Brain Imaging

Healthy volunteers: Inclusion Criteria: * Age 18 to 70 * Strongly motivated to participate to the study * Signed informed consent for the study Exclusion Criteria: * major cognitive deficit and unable to understand the instructions * previous neurology or psychiatric or sleep pathologies * Woman with a positive pregnancy test during the inclusion. * Subjects under guardianship, curatorship or safeguard of justice protection * Subjects deprived of their liberty * Subject not affiliated to a social security system. * Subject's refusal to be informed if an abnormality is detected during MEG and MRI scans * Subject with common contraindications to MEG and MRI examination : * Metal in the body incompatible with performance of the examination (pacemaker, implantable pump, neurostimulator, cochlear implant, auditory prothesis, metalic prothesis, intracerebral clip, implantable defibrillator, any metalic parts in the brain or upper part of the body, ventriculoperitoneal valve, dental appliance or steel pivot for root canal, ferromagnetic foreign body in the upper part of the upper part of the body) * Claustrophobia Subjects who suffered a mild concussion: Inclusion Criteria: * Male aged from 18 to 40 * Strongly motivated to participate to the study * Signed informed consent for the study * Mild concussion confirmed by the club doctor and a neurologist neurologist in the three weeks preceding the experiment Exclusion Criteria: * major cognitive deficit and unability to understand the instructions * previous neurology or psychiatric or sleep pathologies except mild concussion * Woman with a positive pregnancy test during the inclusion. * Subjects under guardianship, curatorship or safeguard of justice protection * Subjects deprived of their liberty * Subject not affiliated to a social security system * Subject's refusal to be informed if an abnormality is detected during MEG and MRI scans * Subject with common contraindications to MEG and MRI examination : * Metal in the body incompatible with performance of the examination (pacemaker, implantable pump, neurostimulator, cochlear implant, auditory prothesis, metalic prothesis, intracerebral clip, implantable defibrillator, any metalic parts in the brain or upper part of the body, ventriculoperitoneal valve, dental appliance or steel pivot for root canal, ferromagnetic foreign body in the upper part of the upper part of the body) * Claustrophobia