It could not merely be that ‘language or grammar made thought clearer’. That is in all likelihood correct, but it doesn’t speak to how or when language or grammar came into being. Nor does it offer any details on how it spread, either genetically or culturally. Otherwise, bandying about the word ‘mutation’ is unwarranted and speculative. This is the major weakness of the saltationist or what one might refer to as the ‘X-Men’ theory of language origin. Moreover, such a conjecture is unnecessary. Good old-fashioned Darwinian natural selection offers a more scientifically grounded story.
