In fact, we humans perform face-to-face communication more frequently than great apes. For example, when eating or talking, we face each other and look at each other's faces.

If eating is just the intake of nutrition and conversation is just information exchange, why do we need to maintain the posture of facing each other?

It must be because face-to-face communication is important in coordinating human social relationships.

■References (Books, papers, Web articles, etc.)
『人類進化論——霊長類学からの展開——』　第6章・第1節　攻撃と和解　　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）
『「サル化」する人間社会』　第2章　ゴリラの魅力　　山極寿一　（集英社、2014）

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■The References list of “Evolution of Human Sociality”