Drug Siponimod Improves Thinking Speed in Multiple Sclerosis by Pooja Shete on December 18, 2020 at 7:09 PM The study was published in the journal Neurology, the medical journal of American Academy of Neurology. Multiple sclerosis (MS) is neurodegenerative which affects the person's thinking skills. Multiple sclerosis is one of the most common demyelinating disease and is commonly seen in high income countries. Cognitive processing speed is the amount of time taken by a person to take in information, process it, and then react to complete a task. It can affect different aspects of daily life including driving skills, social activities, and employment.