* Subject with no history of previous or concomitant neurological and psychiatric diseases at the time of inclusion
* Subject without a history of traumatic brain injury
* Subject with no vascular history (arterial hypertension, stroke) or concomitant at the time of its inclusion
* Subject has no history of chronic drug and/or alcohol abuse
* Subject having received information regarding the study and having signed an informed consent
* Beneficiary or entitled person to a social security scheme
For MS patients
* Male or female aged 18 to 52
* Patient diagnosed with MS according to the
* criteria of McDonald 2017
* Patient presenting a maximum EDSS of 6
* Patient with MS for less than 10 years of evolution
* Patient having received information regarding the study and having signed an informed consent
* Patient beneficiary or entitled to a plan of social security
You may not be if
For healthy subjects :
* Subject presenting a contraindication to performing an MRI: pacemaker, presence of metal implants, claustrophobia.
* Subject unable to maintain a supine position for a prolonged period
* Subject in a period of exclusion from another research protocol at the time of signing consent/non-opposition form
* Subjects covered by articles L1121-5 to 1121-8 of the Public Health Code (minor patient, adult patient under guardianship or curatorship, patient deprived of liberty, pregnant or breastfeeding woman)
For MS patients
* Subject presenting a contraindication to performing an MRI: pacemaker, presence of metal implants, claustrophobia.
* Subject unable to maintain a supine position for a prolonged period
* Subject in a period of exclusion from another research protocol at the time of signing consent/non-opposition form
* Subjects covered by articles L1121-5 to 1121-8 of the Public Health Code (minor patient, adult patient under guardianship or curatorship, patient deprived of liberty, pregnant or breastfeeding woman)
