Three arguments are advanced from human and nonhuman primate infancy research for the exaptation of ingestive mouth movements (tongue protrusion and lip smacking) for the purposes of social communication: their relation to affiliative behaviours, their sensitivity to social context, and their role in social development. Although these behaviours may have an aerodigestive function, such an account of their occurrence is only partial.

中文翻译：

---

超越呼吸消化：人类和非人类灵长类动物社会交流中与进食相关的嘴部运动的扩展

从人类和非人类灵长类动物的婴儿期研究中提出了三个论点，以解释为社会交流目的而吞食的嘴部运动（伸出舌头和咂嘴）：它们与亲和行为的关系，它们对社会环境的敏感性，以及它们在社会发展中的作用. 尽管这些行为可能具有呼吸消化功能，但对它们发生的这种描述只是部分的。