Wednesday, April 6, 2011

Autism affects information processing in the brain

AUTISM


Autism is a disorder of neural development, characterized by impaired social interaction ,difficulty in  communication , restricted and repetitive behavior in affected children. These characters all begin before the child is three years old.Autism affects information processing in the brain by changing the way nerve cells and synapses to connect and organize the way that happens  is not well understood. It is one of three conditions set forth in the Autism Spectrum Disorders (ASD), the other two have Asperger syndrome, who do not have delays in cognitive development and language disorder and pervasive developmental disorder not otherwise specified ( usually abbreviated PDD-NOS), which is diagnosed when all criteria for autism or Asperger syndrome are not met.

Autism having a strong genetic problem , but its genetics are complex and it is not clear whether ASD is explained more in rare mutations or rare combinations of common genetic variants.In rare, autism is strongly associated with agents that cause birth defects. Controversies surround other causes environmental proposals, such as heavy metals, pesticides or vaccines for children, in the vaccine hypotheses are biologically implausible and there is no convincing scientific evidence. The incidence of autism is about 1-2 /1000 inhabitants, the incidence of ASD is about 6 for 1000, about four times as many men than women. The number of people diagnosed with autism has increased considerably since 1980, partly because of changes in diagnostic practices, whether actual prevalence has increased is unresolved.

Parents usually notice signs of this disorder in the  children in first two years of life. The symptoms usually develop gradually, but first, in some autistic children to develop normally and then regress. Although early intervention behavioral or cognitive can help autistic children have self-care, social and communication skills, there is no known cure for this . Not many children with autism live independently after reaching adulthood, although some have successful. Autistic culture has developed, and some people who want to improve and others believe should be adopted by the difference between autism and the disease being treated.



Also conducted research on a treatment or cure difficult because there are so many different levels of autism and the origin is not clear ,there are environmental factors that determine whether autism is increasing, if autism is genetic, or is a birth defect.

Although people with Asperger syndrome tend to have better cognitive performance than those with autism, the degree of overlap between Asperger's syndrome, HFA, and non-syndromic autism is not clear.



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