Test of Variables of Attention, or T.O.V.A., is an objective, neuropsychological test that measures a person’s sustained and selective attention. The T.O.V.A. is the most widely used objective measure of attention in the world, and is considered the "Gold Standard" among measures of its type. Over 150 studies have been done utilizing the T.O.V.A. to detect attention in people with attention disorders and traumatic brain injuries. The TOVA Research and Education Foundation has provided researchers with the T.O.V.A. to be used in objective assessment of attention. Although the T.O.V.A. can accurately identify 87% of normal people, 84% of non-hyperactive ADHD, and 90% of the hyperactive that take the test, the test or its makers never make a claim the test can diagnose medical conditions such as Attention Deficit Disorders or Traumatic Brain Injuries. The test is a tool that the clinician can use along with history, interviews, behavior ratings and symptom to accurately diagnose and treat attention disorders.