Idiot
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An idiot, in modern use, is a stupid or foolish person. Idiot was formerly a technical term in legal and psychiatric contexts for some kinds of profound intellectual disability where the mental age is
The Idiot by Evert Larock (1892)
Mental age
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Mental age is a concept related to intelligence and maturity. It looks at how a specific individual, at a specific age, performs intellectually, compared to average intellectual performance for that i
Idiot
…idiocy". In the early 1900s, Dr. Henry H. Goddard proposed a classification system for intellectual disability based on the Binet-Simon concept of mental age. Individuals with the lowest mental age level (less than three years) were identified as idiots; imbeciles had a mental age of three to seven years…
Intellectually disabled patients with 1- and 2-year-old mental ages
A 78-year-old intellectually disabled woman whose "mental condition has always been that of a child 5 or 6 years of age"