this circuit may be equated with consciousness of the Great God Pan in his aspect of Life as a whole, or with consciousness of the Gaia, in which the biosphere is considered as a single organism. Proponents of the Eight Circuit model believe that it is activated by 200-500 μg LSD, higher doses of peyote or psilocybin mushrooms, and by meditation. The circuit, according to the model, first appeared among the Hindus in the early first millennium and later reappeared amongst Sufi sects. Eighth Circuit Leary referred to this as the Neuro-Atomic Metaphysiology and Wilson as the Non-Local Quantum Circuit. The eighth circuit is concerned with quantum consciousness, non-local awareness (information from beyond ordinary space-time awareness which is limited by the speed of light), illumination. Some of the ways this circuit can get activated are: near-death experiences, DMT, high doses of LSD and, according to Wilson, almost any dose of ketamine. Leary's contribution Leary stated that the theories presented in Info-Psychology "are scientific in that they are based on empirical findings from physics, physiology, pharmacology, genetics, astronomy, behavioral psychology, information science, and most importantly, neurology." Leary called his book "science faction" or "psi-phy" and noted he had written it "in various prisons to which the author had been sentenced for dangerous ideology and violations of Newtonian and religious laws". Although Leary propounded the basic premise of eight "brains" or brain circuits, he was inspired by sources such as the Hindu chakra system. Leary claimed that among other things this model explained the social conflict in the 1960s, where the mainstream was said to be those with four circuits active and characterized by Leary as tribal moralists and clashed with the counter-culturists, who were then said to be those with the fifth circuit active and characterized as individualists and hedonists. Leary's first book on the subject, Neurologic, included only seven circuits when it was published in 1973. Exo-Psychology, published in 1977, expanded the number of circuits to eight and clarified the subject. In it, he puts forward the theory that the later four circuits are "post terrestrial;" intended to develop as we migrate off this planet and colonize others. Once we begin space migration, according to Leary, we will have more ready access to these higher circuits. Exo-Psychology was re-published as revised by Timothy Leary with additional material in 1989 under the title Info-Psychology (New Falcon Publishing). Other authors on the