Stimulants alleviate information processing and task performance deficits in Attention Deficit/Hyperactivity Disorder (ADHD). Long acting formulations of amphetamines such as lisdexamphetamine dimesylate (LDX) are especially valuable as they target the school day and improve classroom performance. Although stimulants have been widely used in treatment of ADHD, the exact mechanism action and effect on task performance is not completely known.