![Perhaps the most famous of Terence mckenna's theories and observations is his explanation for the origin of modern human consciousness and culture. mckenna theorized that as the North African jungles receded, near the end of the most recent ice age, giving way to savannas and grasslands, a branch of our tree-dwelling primate ancestors left the forest canopy and began to live in the open areas outside of the forest. There they experimented with new varieties of foods as they adapted, physically and mentally, to their new environment. Among the new food items found in this new environment were psilocybin-containing mushrooms growing near the dung of ungulate herds that occupied the savannas and grasslands at that time. mckenna, referencing the research of Roland L. Fisher, Ph.D. (College of Optometry and Departments of Psychiatry and Pharmacology, College of Medicine, The Ohio State University)[14] [15] [16] [17], claimed that enhancement of visual acuity was an effect of psilocybin at low doses, and supposed that this would have conferred an adaptive advantage. He also argued that the effects of slightly larger doses, including sexual arousal (not reported as a typical effect in scientific studies[citation needed]) — and in still larger doses, ecstatic hallucinations and glossolalia — gave selective evolutionary advantages to members of those tribes who partook of it. There were many changes caused by the introduction of this psychoactive mushroom to the primate diet <b>...</b>](http://img.youtube.com/vi/_7xj8v0WC0k/2.jpg)
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Operating System
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