Abstract: Systems and methods for assisting with diagnosing and/or titrating medication for predetermined conditions and/or assessing the effectiveness of medication prescribed for a predetermined condition including, but not limited to, Attention Deficit Disorder (“ADD”) and Attention Deficit Hyperactivity Disorder (“ADHD”). A diagnostic test is provided that includes display of both target and non-target images. Responses to these display images are analyzed to measure subject criteria including response time consistency, response time, impulsivity, omissions, multiple responses, and guessing. Such data, or numerical quantifiers calculated from such data, may be used to assist with titrating medication for one or more predetermined conditions and/or assessing the effectiveness of medication prescribed for a predetermined condition.