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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]
The epidemiology of autism is the study of the incidence and distribution of autism spectrum disorders (ASD). A 2022 systematic review of global prevalence of autism spectrum disorders found a median prevalence of 1% in children in studies published from 2012 to 2021, with a trend of increasing prevalence over time.
ADHD was found more often in boys, at a rate of 2:1. [10] The most common form of ADHD was inattentive (2.95% of total population), followed by hyperactive/impulsive (2.77%), then combined (2.44%). [10] While differences in prevalence rate were found internationally, it is not clear whether this reflects true differences or changes in ...
World Autism Day, also called World Autism Awareness Day, is marked on 2 April. It was designated by the United Nations General Assembly at the end of 2007. [93] On 2 April 2009, activists left 150 strollers near Central Park in New York City to raise awareness that one in 150 children is estimated to be autistic. [94] There are many ...
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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]
Brain sections related to autism. Many causes of autism, including environmental and genetic factors, have been recognized or proposed, but understanding of the theory of causation of autism is incomplete. [1] Attempts have been made to incorporate the known genetic and environmental causes into a comprehensive causative framework. [2]
Autism, also called autism spectrum disorder (ASD) or autism spectrum condition (ASC), is a neurodevelopmental disorder characterized by symptoms of deficient reciprocal social communication and the presence of restricted, repetitive, and inflexible patterns of behavior. While its severity and specific manifestations vary widely across the ...