Tool-use-associated sound in the evolution of language

摘要: Proponents of the motor theory language evolution have primarily focused on visual domain and communication through observation movements. In present paper, it is hypothesized that production perception sound, particularly incidental sound locomotion (ISOL) tool-use (TUS), also contributed. Human bipedalism resulted in rhythmic more predictable ISOL. It has been proposed this stimulated musical abilities, auditory working memory, abilities to produce complex vocalizations mimic natural sounds. Since human brain proficiently extracts information about objects events from sounds they produce, TUS, mimicry might achieved an iconic function. The prevalence symbolism many extant languages supports idea. Self-produced TUS activates multimodal processing (motor neurons, hearing, proprioception, touch, vision), stimulates primate audiovisual mirror which likely stimulate development association chains. Tool use gestures involve forelimbs, associated with vertebrate vocal communication. production, perception, may a limited number or protowords were tool use. A new way communicate tools, especially when out sight, would had selective advantage. gradual change acoustic properties and/or meaning could arbitrariness expanded repertoire words. Humans increasingly exposed over millions years, coinciding period during spoken evolved. ISOL tool-use-related are worth further exploration.