Fluctuations in human mood (a preliminary study)

Abstract
One subject rated his mood daily for 1500 consecutive days. The resulting time series was analysed for significant cycles. Although the series exhibited a manifest and dominant 7‐day period, significant cycles of 2.4, 3.7, 5.5, 10.5, 18, 19.7, 28, and 57.8‐days were also found.

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