Yawning - yawning (English spelling)

Japanese: あくび(欠伸) - あくび（英語表記）yawning

Yawning is a unique breathing movement that consists of a long, deep inhalation (breathing in) with the mouth wide open, followed by a slow exhalation (breathing out). Yawning usually lasts for 5 to 10 seconds, with the inhalation period being long. Yawning is accompanied by contraction of the extensor muscles of the entire body, particularly the extension of the upper and lower limbs and trunk backwards. It occurs frequently in newborns. Yawning is seen not only in humans but also in various animals, and can be induced experimentally by electrical stimulation of a specific part of the brain (the internal capsule).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

あくびは，口を大きく開いて，長く，深い吸息(息を吸い込む動作)とこれに続いて起こるゆっくりとした呼息(息を吐き出す動作)とからなる特有な呼吸動作をさす。通常，あくびの持続時間は5～10秒で，吸息の時期が長い。あくびに伴って全身の伸筋の収縮が同時に起こり，とくに上肢や下肢，軀幹を後方へ伸ばす動作を伴う。新生児では頻繁に起こる。あくびは，ヒトだけでなく種々の動物でもみられ，実験的には脳の特定部位(内包)への電気刺激によって起こすことができる。

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