1. Neurological comorbidity.\*;

2. Relapses or requires treatment with steroids within 30 days from enrollment;

3. Is pregnant at the time of enrollment.\*;

4. Has any metal parts in their body (i.e. Cochlear (ear) implant, metal braces (dental fillings are o.k.).\*;

5. Is younger than 6 years of age.\*;

6. Is older than 18 years of age.\*;

7. Has prior history of traumatic brain injury, neurological disorder, cerebral palsy, developmental delay or learning disability.\*;

8. Requires sedation for brain scanning.\*;

9. Is claustrophobic, as brain scanning requires children to enter a tunnel in the MRI machine.\*

Cognitive Dysfunction in MS: Using Altered Brain Oscillation to Link Molecular Mechanisms With Clinical Outcomes