Until words appeared, human communication was a combined expression of gestures and sounds. Such face-to-face communication is important in reading another person’s emotions and influencing them, and the eyes play a major role.* Along with music, face-to-face interaction with eye contact strengthened bonds among peers, enhancing their sense of unity and promoting cooperative action.
In this way, pre-language communication is thought to have played the role of an adhesive that strengthened personal connections.
■References (Books, papers, Web articles, etc.)
『人類進化論——霊長類学からの展開——』 第6章・第3節 対面交渉と食物の分配 山極寿一 （裳華房、2008）
『家族進化論』 第6章・第10節 コミュニケーションの変容 山極寿一 （東京大学出版会、2012）
*Human eyes have wide eyelids and a clear distinction between the colors of the white and the iris, so the movement of the eyes can be clearly detected. Among primates, the white portion of the eye is only found in humans, and it is possible to “read another’s thoughts” by observing their eye movement.
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