Cognitive Grammar and the Birth of Technology: Why Fire Needed Language/ The Konno Triangle

This paper presents an integrated hypothesis linking cognitive grammar, vocal tract geometry, and early human technological behavior. It proposes that the anatomical structure known as the Konno Triangle—a near-equilateral triangle formed by the posterior nasal spine (PNS) and the bilateral third molars (M₃)—provides a biomechanical basis for the production of open vowels, especially /a/. At the same time, the paper argues that structured language, including syntax capable of expressing conditionals, sequences, and imperatives, was a necessary precondition for the emergence of complex behaviors such as fire control, tool-making, and knowledge transmission. Together, these two domains—anatomical vocal resonance and grammatical cognition—co-evolved to form the foundation of human language and technology.