Practiced systematically, these [yogic] exercises result, after a time, in prolonged suspensions of breath. Long suspensions of breath lead to a high concentration of carbon dioxide in the lungs and blood, and this increase in the concentration of CO2 lowers the efficiency of the brain as a reducing valve and permits the entry into consciousness of experiences, visionary or mystical, from "out there."
Prolonged and continuous shouting or singing may produce similar, but less strongly marked, results. Unless they are highly trained, singers tend to breathe out more than they breathe in. Consequently the concentration of carbon dioxide in the alveolar air and the blood is increased and, the efficiency of the cerebral reducing valve being lowered, visionary experience becomes possible. Hence the interminable "vain repetitions" of magic and religion. The chanting of the CURANDERO, the medicine man, the shaman; the endless psalm singing and sutra intoning of Christian and Buddhist monks; the shouting and howling, hour after hour, of revivalists---under all diversities of theological belief and aesthetic convention, the psychochemico-physiological intention remains constant. To increase the concentration of CO2 in the lungs and blood and so to lower the efficiency of the cerebral reducing valve, until it will admit biologically useless material from Mind-at-Large---this, though the shouters, singers and mutterers did not know it, has been at all times the real purpose and point of magic spells, of mantrams, litanies, psalms and sutras. "The heart," said Pascal, "has its reasons." Still more cogent and much harder to unravel are the reasons of the lungs, the blood and the enzymes, of neurons and synapses. The way to the superconscious is through the subconscious, and the way, or at least one of the ways, to the subconscious is through the chemistry of individual cells.
ALDOUS HUXLEY
HEAVEN AND HELL
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