Asperger syndrome
Asperger syndrome (AS), also known as Asperger's, is a neurodevelopmental disorder characterized by significant difficulties in social interaction and nonverbal communication, along with restricted and repetitive patterns of behavior and interests. It is an autism spectrum disorder (ASD), but differs from other ASDs by relatively unimpaired language and intelligence. Although not required for diagnosis, physical clumsiness and unusual use of language are common. Signs usually begin before two years of age and in many cases never resolve.
The exact cause of Asperger's is unknown. While it is largely inherited, the underlying genetics have not been determined conclusively. Environmental factors are also believed to play a role. Brain imaging has not identified a common underlying condition. In 1992, the diagnosis of Asperger's was added to in the tenth edition of the "Diagnostic and Statistical Manual of Mental Disorders"; it was removed in 2013, with the symptoms now included within the autism spectrum disorder along with autism and pervasive developmental disorder not otherwise specified (PDD-NOS). It remains within the International Classification of Diseases (ICD-11) as a subtype of autism spectrum disorder.
There is no single treatment, and the effectiveness of particular interventions is supported by only limited data. Treatment is aimed at lowering obsessive or repetitive routines and improving communication skills and physical clumsiness. Interventions may include social skills training, cognitive behavioral therapy, physical therapy, speech therapy, parent training, and medications for associated problems, such as mood or anxiety. Most children improve as they grow up, but social and communication difficulties usually persist. Some researchers and people on the autism spectrum have advocated a shift in attitudes toward the view that autism spectrum disorder is a difference rather than a disease that must be treated or cured.
In 2015, Asperger's was estimated to affect 37.2 million people globally (about 0.5% of people). Autism spectrum disorder is diagnosed in males more often than females, and females are typically diagnosed at a later age. The syndrome is named after the Austrian pediatrician Hans Asperger, who, in 1944, described children in his care who struggled to form friendships, did not understand others' gestures or feelings, engaged in one-sided conversations about their favorite interests, and were clumsy. The modern conception of Asperger syndrome came into existence in 1981 and went through a period of popularization. It became a standardized diagnosis in the early 1990s. Many questions and controversies about the condition remain. There is doubt about whether it is distinct from high-functioning autism (HFA). Partly because of this, the percentage of people affected is not firmly established.
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