ADD and ADHD are the same disorder, ADHD is the currently accepted terminology for attention deficits. Attention Deficit Hyperactivity Disorder can occur in three forms: one that is predominantly hyperactive, one that is predominantly inattentive, and one that is mixed. ADHD typically affects the ability to process across modalities, is diagnosed primarily by a checklist of symptoms, and typically responds to medication. In contrast, APD is viewed as an auditory input disorder that affects the way sound (including spoken language) is processed specifically, is diagnosed by a special battery of tests administered by an audiologist, and does not respond to medication. ADHD and APD can co-exist in the same child or adult, so it is important to separate the symptoms of the two. Recent research indicates that the primary complaints and symptoms of ADHD and APD, while overlapping somewhat, are actually quite different. For example, the two most common symptoms of ADHD are inattention and distractibility. Although these symptoms occur in APD, too, they are farther down the list of common complaints. The two most common symptoms of APD are difficulty hearing in background noise and difficulty following oral directions. Other behavioral symptoms pretty clearly separate ADHD and APD, as well. If ADHD is suspected, it is important that you have it ruled out or treated prior to considering testing for APD because attention deficits can affect performance on the tests of APD. Therefore, differentiating ADHD and APD requires the joint cooperation of physician/psychologist and audiologist.