Researchers are challenging the idea thta the human language arose from a single mutation. The logic for the theory of lanuage being a product of a single mutation is the “universal grammar” being supposedly shared by all the languages of the world.The fossil evidence does not suggest such a single mutation. Another theory proposed was the amended scenario of two mutations : one the rudimentary proto-language for pre-Homo Sapiens speakers and the second,around the birth of the Homo Sapiens that gave us the whole syntax.
Evidence from the fossil record indicates a gradual evolution of the speech organs , suggesting a gradual evolution of speech supported by a gradual evolution of the organs.
http://scienceblogs.com/cognitivedaily/2006/11/researchers_poopoo_the_notion.php
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