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Autism was first described by Leo Kanner in 1943 and is known to affect 1 in 500 Americans with boys being four times more likely to have autism than girls. Although the focus of research is on children, there are many adults who are living with autism. Research on Autism is relatively new, as in the past those with autism were grouped into the broad category of mental retardation. Autism falls under the category of Pervasive Developmental Disorders, PDD, which also includes Asperger's Disorder, Rett's Disorder, Childhood Disintegrative Disorder, and PDD not otherwise specified (atypical autism). These disorders all differ from each other and within themselves differ in severity and level of functioning. Autism is a Spectrum Disorder which indicates that its symptoms can present themselves in various combinations which may range from mild to severe. It is extremely difficult to define a standard autistic person several terms, which also...

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