Isolated in worlds of their own, people with autism appear indifferent and remote and are unable to form emotional bonds with others. Although people with this baffling brain disorder can display a wide range of symptoms and disability, many are incapable of understanding other people's thoughts, feelings, and needs. Often, language and intelligence fail to develop fully, making communication and social relationships difficult. Many people with autism engage in repetitive activities, like rocking or banging their heads, or rigidly following familiar patterns in their everyday routines. Some are painfully sensitive to sound, touch, sight, or smell.

Children with autism do not follow the typical patterns of child development. In some children, hints of future problems may be apparent from birth. In most cases, the problems become more noticeable as the child slips farther behind other children the same age. Other children start off well enough. But between 18 and 36 months old, they suddenly reject people, act strangely, and lose language and social skills they had already acquired.

As a parent, teacher, or caregiver you may know the frustration of trying to communicate and connect with children or adults who have autism. You may feel ignored as they engage in endlessly repetitive behaviors. You may despair at the bizarre ways they express their inner needs. And you may feel sorrow that your hopes and dreams for them may never materialize.

But there is help-and hope. Gone are the days when people with autism were isolated, typically sent away to institutions. Today, many youngsters can be helped to attend school with other children. Methods are available to help improve their social, language, and academic skills.

Autism is found in every country and region of the world, and in families of all racial, ethnic, religious, and economic backgrounds. Emerging in childhood, it affects about 3 or 4 people in every thousand and is three to four times more common in boys than girls. Girls with the disorder, however, tend to have more severe symptoms and lower intelligence.