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One theory on the evolutionary and biological origins of autism traits in Homo sapiens that has gained recent attention in the 2010s and 2020s is that some genes linked to autism may have originated from early humans crossbreeding with Neanderthals, an extinct group of archaic humans (generally regarded as a distinct species, Homo ...
PDD-NOS was one of four disorders collapsed into the diagnosis of autism spectrum disorder in the DSM-5, [3] and also was one of the five disorders classified as a pervasive developmental disorder (PDD) in the DSM-IV. [4] The ICD-10 equivalents also became part of its definition of autism spectrum disorder, as of the ICD-11.
There are some who believe that regressive autism is simply early-onset autism which was recognized at a later date. Researchers have conducted studies to determine whether regressive autism is a distinct subset of ASD, but the results of these studies have contradicted one another. [15]
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.
Identical twin studies put autism's heritability in a range between 36% and 95.7%, with concordance for a broader phenotype usually found at the higher end of the range. [28] Autism concordance in siblings and fraternal twins is anywhere between 0 and 23.5%. This is more likely 2–4% for classic autism and 10–20% for a broader spectrum.
Dirk van Krevelen published the paper "Een geval van 'early infantil autism'" (A case of early infantile autism) in 1952. [214] It was the first European paper about "early infantile autism". In it, van Krevelen notes that while the condition is well known by United States child psychiatrists, it is virtually unknown in Europe. [135]
Autism is a neurodevelopmental disorder characterized by impaired social interaction and communication, repetitive behaviours, restricted interests, and sensory processing issues. Uta Frith of University College London first advanced the weak central coherence theory in the late 1980s. [ 1 ]
The idea of a link between vaccines and autism was extensively investigated and shown to be false. [15] The scientific consensus is that there is no relationship, causal or otherwise, between vaccines and incidence of autism, [ 16 ] [ 17 ] [ 15 ] and vaccine ingredients do not cause autism.