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The autism spectrum may comprise a small set of disorders that converge on a few common molecular pathways, or it may be a large set of disorders with diverse mechanisms. [16] Autism appears to result from developmental factors that affect many or all functional brain systems. [17]
The severity of symptoms and functional impairment vary between individuals. [3] There are many known environmental, genetic, and biological causes of autism. Research indicates that genetic factors predominantly contribute to its appearance. The heritability of autism is complex and many of the genetic interactions involved are unknown. [1]
The majority of the available evidence does not support the use of this diet in the treatment of autism. [3] [4]American Academy of Pediatrics – Clinical Report (2007) In their report, the AAP did not recommend the use of special diets for children with autism spectrum disorder because of inadequate evidence.
For 21-year-old Matthew Schlenker, salad is more than a side dish. It's a source of pride and joy. And it's a living. Matthew is one of about 20 students at Somerset Hills Learning Institute in ...
The review found that CBT was moderately to highly effective at reducing anxiety in school children with autism spectrum disorder, but that effects varied depending on whether they were reported by clinicians, parents or self-reported. Treatments involving parents and one-on-one compared to group treatments were more effective. [12]
The World Health Organization estimates about 1 in 100 children had autism during the period from 2012 to 2021 as that was the average estimate in studies published during that period with a trend of increasing prevalence over time. However, the study's 1% figure may reflect an underestimate of prevalence in low-and middle-income countries.
The scientific study of the causes of developmental disorders involves many theories. Some of the major differences between these theories involves whether environment disrupts normal development, if abnormalities are pre-determined, or if they are products of human evolutionary history which become disorders in modern environments (see evolutionary psychiatry). [5]
Symptoms can be detected before the age of two and experienced practitioners can give a reliable diagnosis by that age. However, official diagnosis may not occur until much older, even well into adulthood. There is a large degree of variation in how much support a person with ASD needs in day-to-day life. This can be classified by a further ...