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It is unknown whether early brain overgrowth occurs in all children with autism. It appears to be most prominent in the frontal and temporal lobes , which are associated with higher cognitive specializations such as social cognition , and language development . [ 22 ]
Classic autism, also known as childhood autism, autistic disorder, or Kanner's syndrome, is a formerly diagnosed neurodevelopmental disorder first described by Leo Kanner in 1943. It is characterized by atypical and impaired development in social interaction and communication as well as restricted, repetitive behaviors, activities, and interests.
Although linked with early childhood, the symptoms can appear later as well. 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.
The theory of the double empathy problem is a psychological and sociological theory first coined in 2012 by Damian Milton, an autistic autism researcher. [2] This theory proposes that many of the difficulties autistic individuals face when socializing with non-autistic individuals are due, in part, to a lack of mutual understanding between the two groups, meaning that most autistic people ...
It reviewed 30 years of research into early infantile autism and childhood schizophrenia. In it he bemoaned the diagnosing of intellectually disabled children with a few autistic features as singularly having autism. [254] The "First International Leo Kanner Colloquium on Child Development, Deviations, and Treatment" was held in October 1973.
The development of autism is associated with several prenatal risk factors, including advanced age in either parent, diabetes, bleeding, and maternal use of antibiotics and psychiatric drugs during pregnancy. [1] [51] [52] Autism has been linked to birth defect agents acting during the first eight weeks from conception, though these cases are ...
PDD-NOS included atypical autism, a diagnosis defined in the ICD-10 for the case that the criteria for autistic disorder were not met because of late age of onset, or atypical symptomatology, or both of these. [5] Even though PDD-NOS was considered milder than typical autism, this was not always true. While some characteristics may be milder ...
There are two possible developmental courses of autism. One course of development is more gradual in nature, with symptoms appearing fairly early in life and persisting. [9] A second course of development is characterized by normal or near-normal development before onset of regression or loss of skills, which is known as regressive autism. [10]
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