Boundary (Intelligence) - Kyokai

Japanese: 境界(知能) - きょうかい
Boundary (Intelligence) - Kyokai

...Also, when a person has delays in language acquisition and sensory development due to hearing loss, their original intelligence is maintained, so this is called pseudo-mental retardation.
[Classification]
The WHO classifies mental retardation into severe, severe, moderate, mild, and borderline according to intelligence quotient (IQ), but traditionally it is classified as idiot, stupid, dumb, and borderline. In general, emotional disorders are not as noticeable as intellectual disorders, and people may be sociable, affectionate, and easygoing.

*Some of the terminology explanations that mention "boundary (intelligence)" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また,難聴によって言語の習得と知覚発達に遅れがあるものは,本来の知能は保たれているので,仮性の精神遅滞という。
[分類]
 WHOは知能指数(IQ)によって,精神遅滞を最重度,重度,中等度,軽度,境界に分けているが,伝統的には白痴,痴愚,魯鈍(軽愚)および境界に分けられる。一般に情意の障害は知的な障害ほどは目立たず,むしろ人なつこく,愛きょうがあり,すなおなことがある。…

※「境界(知能)」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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