At one time or another, most children show weak concentration, become overactive, or act without thinking. There are some children, however, who show particular and exceptional difficulties with inattention, hyperactivity and impulsivity, which have an effect on their learning and behaviour and which they themselves seem unable to control. These difficulties do not appear to be explained by usual influences such as computer games, too much TV, poor management, diet and so on.
Such children are currently referred to as having Attention Deficit Hyperactivity Disorder (ADHD - sometimes referred to as ADD).
