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The question of speech origins is discussed in the light of the theory that humans had semi-aquatic hominid ancestors. Diving requires a special anatomy of the airway entrances and a very refined control of breathing. The brain structures that "voluntarily" controlled the airway entrances’ closure and breathing could also be used for elaborating the older (early hominid, perhaps gibbon-like) sound production. Later, the evolution of association areas in the brain greatly enhanced human ability for attaching a particular meaning to a conventional sound combination.
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