An FDA-cleared, computerized, and objective measure of attention and inhibitory control for ages 4 to 80 y .Responses to visual or auditory stimuli are recorded with a unique, highly accurate microswitch. The test provides information that is not available through self-report or the report of others. It is used along with a clinical interview and subjective measures for a more comprehensive picture of academic, social, and personal performance and impairment. It helps in diagnosing attention deficit hyperactivity disorder (ADHD).