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. 2017 Jan 24;23(4):923–931. doi: 10.1038/mp.2016.263

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Periodicities in 10 rapid cycling bipolar patients’ mood cycles were synchronous with every second, third, fourth, fifth or sixth oscillation of the moon’s 13.7-day declination tidal cycle. Figure shows results of χ² periodogram analyses of longitudinal observations of the patients’ courses of illness. Statistically significant periodicities that correspond to each of the multiples of the declination cycle are labeled. A number of patients exhibited more than one type of synchrony during their courses of illness.