no history of alcohol/drug abuse or nervous system disorder other than MS

no sensory impairments that might interfere significantly with cognitive testing

no developmental history of learning disability or attention-deficit/hyperactivity disorder

no medical condition other than MS that could substantially affect cognition

no relapse and/or corticosteroid use within four weeks of assessment;

no current use of modafinil, armodafinil or other psychostimulants.

Impact of Armodafinil on Neurocognition and Cognitive Fatigue in Multiple Sclerosis (MS)