Well we found other things but, yes, they are man-made.
I believe this question cannot be answered with a straightforward yes or no.
There were two categories of verbal forms : yes (oui) and no (non).
Pointing gestures and responses, yes\no gestures and responses, imitations, unintelligible utterances, and utterances that included a participant that was not visible were excluded.
If the answer was yes, they were considered for inclusion.
Physicians who indicated "yes" were then asked to describe the differences they had observed.
Yes, because it points to different cognitive functions, different aspects of mind.
Regarding the follow-up bid, it appeared that the distribution of (yes, yes) responses diminished with bid size.
中文繁体
(用於表示接受、願意或贊同)好的,是的, (用於表示正在聽某人說話,或準備聽並作出回答或提供資訊), (用於反駁否定陳述)…
More中文简体
(用于表示接受、愿意或赞同)好的,是的, (用于表示正在听某人说话,或准备听并作出回答或提供信息), (用于反驳否定陈述)…
MoreEspañol
sí, qué, ¿sí?…
MorePortuguês
sim…
More日本語
(相手の肯定の言葉、質問に同意して)はい、ええ, (否定疑問文に同意して)いいえ, (名前を呼ばれて)はい…
MoreTürk dili
evet, öyle, buyurun…
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oui, si, oui [masculine]…
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sí, què…
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