Feasibility and Reliability of Multimodal Evoked Potentials

Inclusion Criteria (Healthy controls): * Ability to understand the purpose and risks of the study and provide signed and dated informed consent and authorization to use protected health information (PHI) in accordance with national and local subject privacy regulations. * Have no significant health issues, ie neuropathy or other demyelinating disorder that can affect testing. Inclusion Criteria (Patients with MS): * Ability to understand the purpose and risks of the study and provide signed and dated informed consent and authorization to use protected health information (PHI) in accordance with national and local subject privacy regulations * Diagnosis of MS (all types) with an expanded disability status scale (EDSS) 0.0 to 6.5 * Have measurable responses on both MEP and SSEP in at least one upper and one lower limb on visit 2. The MEP and SSEP responses do not need to be in the same limb * Have no comorbid condition (ie neuropathy) that could affect testing Exclusion Criteria: * Inability to comply with study requirements * Unspecified reasons that, in the opinion of the Investigator, make the subject unsuitable for enrollment * Any diseases (e.g., non-MS demyelinating diseases), with the exception of diagnosis MS for the MS Cohort, that in the opinion of the Investigator, could influence evoked potential results (including but not limited to medullary trauma, morbid obesity, limb amputation, diabetes, other polyneuropathy) * Conditions interfering with magnetic stimulation (including but not limited to epilepsy, movable metal implants in the body such as pacemakers or stents) * MS relapse within 3 months of either sessions * Initiation of treatment or dose adjustment within 1 month of either sessions with 4-Aminopyridin, Carbamazepine, Baclofen, Tizianid * Febrile illness within 3 days of either sessions.