Terence McKenna

Publisher: Bantam Books (1993)

Thinking about human evolution ultimately means thinking about the evolution of human consciousness. What, then, are the origins of the human mind? In their explanations, some investigators have adopted a primarily cultural emphasis. They point to our unique linguistic and symbolical capabilities, our use of tools, and our ability to store information epigenetically as songs, art, books, computers, thereby creating not only culture, but also history. Others, taking a somewhat more biological approach, have emphasized our physiological and neurological peculiarities, including the exceptionally large size and complexity of the human neocortex, a great proportion of which is devoted to complex linguistic processing, storage, and retrieval of information, as well as being associated with motor systems governing activities like speech and writing. More recently the feedback interactions between cultural influence and biological ontogeny have been recognized and seen to be involved in certain human developmental oddities, such as prolonged childhood and adolescence, the delayed onset of sexual maturity, and the persistence of many essentially neonatal characteristics through adult life. Unfortunately the union of these points of view has not yet led to the recognition of the genome‑shaping power of psychoactive and physioactive dietary constituents.