ALL over the world the calls of the gibbon are so uniform that genetics is deemed responsible. In man, only the capacity and the strong desire to acquire speech is inherited ; speech itself is learned, and its learning is both long and difficult. The coordinated use in speech of articulators, breathing, phonation, and symbolization is the most refined of any motor activity.Since all aspects of speech depend upon the central nervous system, neuropathologic lesions are one frequent cause of speech difficulty. F…
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