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Nobody has come up with an actual reason that autism occurs. Most people believe it is connected with genetics, but nobody has found the gene abnormality, yet. However, it is believed that most cases occur when something goes wrong with the brain during it's development. Research has shown that a child with autism has a lower number of Purkinje cells in their brain, than kids who do not have autism. Unfortunately, not very much is known about autism and how it occurs.