" What triggered these hallucinations? I suggest it was even the slight stress of making a decision in a novel circumstance, whereas in ourselves in modern times the stress threshold for such triggering of a verbal hallucination is much higher. The reason they are so prevalent in all cultures today, in the hospital patients and homeless I have talked about, in children and speechless quadriplegics, is because they were once the genetic basis of this ancient mentality, and the genes for this potentiality are with us today. Verbal hallucinations, we think, evolved along with the evolution of language during the late Pleistocene10 as the response part of the brain register of all admonitory information. "
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