Encyclopediaattention deficit hyperactivity disorder
attention deficit hyperactivity disorder (ADHD), formerly called hyperkinesis or minimal brain dysfunction, a chronic, neurologically based syndrome characterized by any or all of three types of behavior: hyperactivity, distractibility, and impulsivity. Hyperactivity refers to feelings of restlessness, fidgeting, or inappropriate activity (running, wandering) when one is expected to be quiet; distractibility to heightened distraction by irrelevant sights and sounds or carelessness and inability to carry simple tasks to completion; and impulsivity to socially inappropriate speech (e.g., blurting out something without thinking) or striking out. Unlike similar behaviors caused by emotional problems or anxiety, ADHD does not fluctuate with emotional states. While the three typical behaviors occur in nearly everyone from time to time, in those with ADHD they are excessive, long-term, and pervasive and create difficulties in school, at home, or at work. ADHD is usually diagnosed before age seven. It is often accompanied by a learning disability.
The cause of ADHD is unknown, although there appears to be a genetic component in some cases. Intake of sugars, preservatives, and artificial flavorings is no longer considered to be a factor. It has been shown that people with ADHD have less activity in areas of the brain that control attention. Treatment usually includes behavioral therapy and emotional counseling combined with medications such as methylphenidate hydrochloride (Ritalin) or dextroamphetamine (Dexedrine) that correct neurochemical imbalances in the brain. Symptoms may decrease after adolescence, although they often persist into adulthood.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.
More on attention deficit hyperactivity disorder from Infoplease:
- Attention Deficit Hyperactivity Disorder - Mental Illness Facts about Attention Deficit Hyperactivity Disorders Source: National Institute of ...
- Mental Illness in America - Mental Illness An estimated 26.2 percent of Americans 18 and older suffer from a diagnosable mental ...
- Social Phobias - Mental Illness Facts about Social Phobias Source: National Institute of Mental Health Social Phobia ...
- Obsessive-Compulsive Disorder - Mental Illness Facts about Obsessive–Compulsive Disorders Source: National Institute of ...
- Panic Disorders - Mental Illness Facts about Panic Disorders Source: National Institute of Mental Health Panic ...
