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Keywords:

  • semiannual;
  • melatonin;
  • rhythms;
  • time series;
  • season;
  • seasonal disorders

Abstract

Data from the 19th century on hallucinations and magnetic disturbances were found to exhibit a direct and statistically significant correlation. The aa magnetic 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 variation.