Evoked potential tests measure electrical activity in certain areas of the brain in response to stimulation of certain groups of nerves. These tests are often used to assist in the diagnosis of MS because they can indicate problems along the pathways of certain nerves that are too subtle to be noticed or found on a doctor’s exam. Problems along the nerve pathways are a direct result of the disease. The demyelization causes the nerve impulses to be slowed, garbled, or halted altogether. You can test yourself at our sleep center.