At still higher doses psilocybin triggers this activity in the language-forming capacity of the brain that manifests as song and vision. Psilocybin may have synergized the emergence of higher forms of psychic organization out of primitive protohuman animals. It can be seen as a kind of evolutionary enzyme, or evolutionary catalyst.
Terence McKennaWe can move no faster than the evolution of our language, and this is certainly part of what the psychedelics are about: they force the evolution of language.
Terence McKenna