We know from early work of the Canadian neurophysiologist Wilder Penfield that electrical stimulation of certain regions of the brain elicits full-blown hallucinations. People with temporal lobe epilepsy—involving a cascade of naturally generated electrical impulses in the part of the brain beneath the forehead —
experience a range of hallucinations almost indistinguishable from reality: including the presence of one or more strange beings, anxiety, floating through the air, sexual experiences, and a sense of missing time. There is also what feels like profound insight into the deepest questions and a need to spread the word. A continuum of spontaneous temporal lobe stimulation seems to stretch from people with serious epilepsy to the most average among us. (p.115)
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