One of the big questions science continues to seek answers to is, that, after thousands of years of guttural commands, slaps on the back of heads and so forth what compelled primitive man to develop language. Why did the close descendants of mitochondrial eve ( the mother of us all) suddenly take an interest in finding audible correspondences to the specifics of her environment? No doubt genetic natural selection slowly, blindly, stumbled along in the right direction but perhaps a chemical boost sped up the development of the primitive mind.
As our hunter-gatherer forbearers became adept at locating native vegetation of all sorts that was palatable and nourishing they might have happened upon a most unusual fungus, a mushroom that when ingested expanded mental capabilities, awakened their minds to possibilities beyond the wildest imaginings. The psilocybin in the mushroom just may have been the catalyst responsible for the development of a nuanced language. I suspect it may have had something to do with the discovery of supernatural beings as well.