The cause or causes of ASDs are still unknown. Classic Autism was first recognized in 1942 by Dr. Leo Kanner at John's Hopkins Hospital. At nearly the same time, psychologist, Hans Asperger, described a similar group of patients. ASD has been recognized as a medical disorder only in modern times, but there are many historical accounts indicating that autism existed long before the 20th century.
It is generally accepted that ASD is a neurological disorder. Parenting styles do not cause children to have ASDs. Today research around the world focuses on possible causes such as genetics, differences in biological brain function, pre- and post-natal brain development, environmental factors, viral infections and immune responses and deficiencies. Many possible causes are being investigated.
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