The cause of autism is still not known. However, researchers are linking autism to biological, hereditary, and neurological differences in the brain. The scans show significant differences within the cerebellum, including the size and number of Purkinje cells. Children with autism exhibit delays in language, play or social interaction. Two-thirds of those diagnosed with autism will test in the range of mental retardation.
T here are no medical tests that can detect autism.
Instead, observations of the child's behavior are conducted. Parents, teachers, a psychologist, speech pathologist, psychiatrist, and social worker can all provide useful information on the behaviors of a child suspected of having autism. They should focus on how the child communicates and on the child's behavior and developmental levels. Parents can provide information on the child's early developmental history. There is no one approach which alleviates the symptoms of autism.