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Autism spectrum disorder [a] (ASD), or simply autism, is a neurodevelopmental disorder "characterized by persistent deficits in social communication and social interaction across multiple contexts" and "restricted, repetitive patterns of behavior, interests, or activities". [11] Sensory abnormalities are also included in the diagnostic manuals ...
ASD (autism spectrum disorder) is a neurodevelopmental disorder marked by impairments in communicative ability and social interaction, as well as restricted and repetitive behaviors, interests, or activities not suitable for the individual's developmental stage. The severity of symptoms and functional impairment vary between individuals. [3]
Asperger syndrome (AS), also known as Asperger's syndrome or Asperger's, is a diagnostic label that has been used to describe a neurodevelopmental disorder characterized by significant difficulties in social interaction and nonverbal communication, along with restricted, repetitive patterns of behavior and interests. [5]
For ASD other than autism the association is much weaker: the same study reported typical levels of intelligence in about 94% of 53 children with PDD-NOS. [49] Estimates are that 40–69% of individuals with ASD have some degree of an intellectual disability, [31] with females more likely to be in severe range of an intellectual disability.
The most common reason parents reported as the cause of lost ASD diagnosis was new information about the child (73.5%), such as a replacement diagnosis. Other reasons included a diagnosis given so the child could receive ASD treatment (24.2%), ASD treatment success or maturation (21%), and parents disagreeing with the initial diagnosis (1.9%).
Her definition aligned well with that for ASD in the DSM-5. [5] [68] She summarised the condition as being made up of five factors: A peculiar type of thought, with a tendency towards the abstract and schematic. This often combined with a tendency to reason and engage in absurd pondering. The latter often makes them seen as being eccentric.
In the animal models, the significant effects of VPA in causing ASD-like symptoms was demonstrated mainly in rats exposed to VPA on gestation day 12.5, not in other gestation days like day 9, 14.5, etc. [47] [48] The ASD-like symptoms of mice included decreased distressed pup calls, decreased social exploration, decreased social behaviors ...
The amygdala, cerebellum, and many other brain regions have been implicated in autism. [15]Unlike some brain disorders which have clear molecular hallmarks that can be observed in every affected individual, such as Alzheimer's disease or Parkinson's disease, autism does not have a unifying mechanism at the molecular, cellular, or systems level.