AbstractData from the 19th century on hallucinations and magnetic disturbances were found to exhibit a direct and statistically significant correlation. Theaamagnetic index over the period 1868–89 and concurrent visual hallucinatory activity were found to co‐vary (Spearman coefficient = .64;P<.05). Magnetic influences on the pineal hormone, melatonin, are suggested as a possible source of variat
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