Autism is a very common type of pervasive developmental disorder that generates serious communicational and behavioral impairments. People with autism experience pronounced difficulties in interacting with others. Also, patients diagnosed with autism have poor imaginative skills, engage in repetitive, stereotype behaviors and manifest a strong resistance to change. In many cases, autism can also involve a certain degree of mental retardation.

Autism is considered to be the most severe childhood disorder. The overall number of cases of autism has known a pronounced increase in the last decades and the worldwide incidence of the disorder in children is continuously rising. Statistics indicate that autism affects around 1.5 million people in the United States alone. The prevalence of the disorder among the American population is expected to rise with 10 percent each year. For some reason, autism predominantly affects boys, rarely occurring in the opposite sex.

Although modern science has been trying to identify the factors responsible for the occurrence of autism, in present the exact causes of the disorder remain unknown. However, scientists believe that autism occurs due to genetic dysfunctions that interfere with the normal activity of the central nervous system.

Medical scientists suspect that the poor social interaction skills characteristic to people with autism are determined by inappropriate

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