The end points of the evolutionary process are clear. Speech also requires a brain that can “reiterate”-freely reorder a finite set of motor gestures to form a potentially infinite number of words and sentences. The human tongue’s shape and position yields the 1:1 oral‐to‐pharyngeal proportions of the supralaryngeal vocal tract. Human speech involves species‐specific anatomy deriving from the descent of the tongue into the pharynx.
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