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Autism spectrum or autistic spectrum describes a range of conditions classified as neurodevelopmental disorders in the fifth revision of the American Psychiatric Association's ''Diagnostic and Statistical Manual of Mental Disorders 5th edition'' (DSM-5). The DSM-5, published in 2013, redefined the autism spectrum to encompass the previous (DSM-IV-TR) diagnoses of autism, Asperger syndrome, pervasive developmental disorder not otherwise specified (PDD-NOS), and childhood disintegrative disorder. Features of these disorders include social deficits and communication difficulties, stereotyped or repetitive behaviors and interests, sensory issues, and in some cases, cognitive delays. ==Classification== A revision to autism spectrum disorder (ASD) was proposed in the ''Diagnostic and Statistical Manual of Mental Disorders'' version 5 (DSM-5), released May 2013.〔(【引用サイトリンク】title=Home | APA DSM-5 )〕 The new diagnosis encompasses previous diagnoses of autistic disorder, Asperger's disorder, childhood disintegrative disorder, and PDD-NOS. Compared with the DSM-4 diagnosis of autistic disorder, the DSM-5 diagnosis of ASD no longer includes communication as a separate criteria, and has merged social interaction and communication into one category. Rather than categorizing these diagnoses, the DSM-5 has adopted a dimensional approach to diagnosing disorders that fall underneath the autism spectrum umbrella. Some have proposed that individuals on the autism spectrum may be better represented as a single diagnostic category. Within this category, the DSM-5 has proposed a framework of differentiating each individual by dimensions of severity, as well as associated features (i.e., known genetic disorders, and intellectual disability). Another change to the DSM includes collapsing social and communication deficits into one domain. Thus, an individual with an ASD diagnosis will be described in terms of severity of social communication symptoms, severity of fixated or restricted behaviors or interests, and associated features. The restriction of onset age has also been loosened from 3 years of age to "early developmental period", with a note that symptoms may manifest later when demands exceed capabilities. Autism forms the core of the autism spectrum disorders. Asperger syndrome is closest to autism in signs and likely causes;〔 unlike autism, people with Asperger syndrome have no significant delay in language development, according to the older DSM-4 criteria. PDD-NOS is diagnosed when the criteria are not met for a more specific disorder. Some sources also include Rett syndrome and childhood disintegrative disorder, which share several signs with autism but may have unrelated causes; other sources differentiate them from ASD, but group all of the above conditions into the pervasive developmental disorders. Autism, Asperger syndrome, and PDD-NOS are sometimes called the ''autistic disorders'' instead of ASD, whereas autism itself is often called ''autistic disorder'', ''childhood autism'', or ''infantile autism''.〔 Although the older term ''pervasive developmental disorder'' and the newer term ''autism spectrum disorder'' largely or entirely overlap,〔 the former was intended to describe a specific set of diagnostic labels, whereas the latter refers to a postulated spectrum disorder linking various conditions. ASD is a subset of the broader autism phenotype (BAP), which describes individuals who may not have ASD but do have autistic-like traits, such as avoiding eye contact. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Autism spectrum」の詳細全文を読む スポンサード リンク
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