In this interview Tony Wright talks about how the hormone rich sex organs of plants and our symbiotic fruit based diet sustained the brain of Eden. On turning our backs on our natural biological living situation we experienced progressive neural degeneration with loss of perceptual and other abilities. The mechanisms involved included progressive retardation of the left hemisphere of the brain. Shamanic practices including natural biological diet and entheogens are part of a strategy to restore our connection with the plant world and regain the bliss of the brain of Eden.
Click here to read the fascinating paper, Consciousness and the Direction of Structure.
and this one about The Symbiotic Love Children of the Forest