PDDs involve delays in many areas of childhood development. The first signs of autism are usually noticed by the age of three. Many individuals who are autistic also develop epilepsy, a brain disorder that causes convulsive seizures, as they approach adulthood. Other characteristics may include repetitive and ritualistic behaviors, hand flapping, spinning or running in circles, excessive fears, self-injury such as head banging or biting, aggression, insensitivity to pain, temper tantrums, and sleeping and eating disturbances.
Autistic individuals live a normal life span, but most require lifelong care and supervision.
At first, autism was thought to be an attachment disorder resulting from poor parenting. This has been proved to be a myth. While the cause remains a mystery, most specialists now view autism as a brain disorder that makes it difficult for the person to process and respond to the world. Autism has been observed in several members of the same families. Therefore, many scientists believe that, at least in some individuals, autism may be genetic.