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Intellectual disability (ID), also known as general learning disability (in the United Kingdom), [3] and formerly mental retardation (in the United States), [4] [5] [6] is a generalized neurodevelopmental disorder characterized by significant impairment in intellectual and adaptive functioning that is first apparent during childhood.
There are a variety of disabilities affecting cognitive ability.This is a broad concept encompassing various intellectual or cognitive deficits, including intellectual disability (formerly called mental retardation), deficits too mild to properly qualify as intellectual disability, various specific conditions (such as specific learning disability), and problems acquired later in life through ...
Ancient civilizations described and treated a number of mental disorders. Mental illnesses were well known in ancient Mesopotamia, [152] where diseases and mental disorders were believed to be caused by specific deities. [153] Because hands symbolized control over a person, mental illnesses were known as "hands" of certain deities. [153]
"Mental retardation" was renamed "intellectual disability (intellectual developmental disorder)".[13]Speech or language disorders are now called communication disorders—which include language disorder (formerly expressive language disorder and mixed receptive-expressive language disorder), speech sound disorder (formerly phonological disorder), childhood-onset fluency disorder (), and a new ...
Intellectual disability or mental retardation, is defined as assessed to have an IQ below 70, along with limitations in adaptive functioning and onset before the age of 18 years. [3] Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by executive dysfunction. It has effects on attention span ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 6 January 2025. The following is a list of mental disorders as defined at any point by the Diagnostic and Statistical Manual of Mental Disorders (DSM) or the International Classification of Diseases (ICD). A mental disorder, also known as a mental illness, mental health condition, or psychiatric disorder ...
While the term "idiot" is, in the present day, not used in a medical, legal or psychiatric context, instead meaning a stupid or foolish person, the term previously held meaning as a technical term used in both legal and psychiatric contexts for some type of profound intellectual disability, wherein the disabled person's mental age was considered to be two years or less.
A common example of pleiotropy is the human disease phenylketonuria (PKU). This disease causes mental retardation and reduced hair and skin pigmentation, and can be caused by any of a large number of mutations in the single gene on chromosome 12 that codes for the enzyme phenylalanine hydroxylase, which converts the amino acid phenylalanine to ...