7-year (circaseptennian) patterns in psychology and biology? Comment on Verhulst and Onghena.
Nonlinear rhythmometry confirms a pattern of about 7 years, describing the number of births by birth year of quantum fathers reported by Verhulst and Onghena in 1996 and estimates the period to be 6.53 years with a 95% confidence interval overlapping 7 years. Other patterns of about 7 years are found in biology, as shown herein for the mean gonadal weight of an echinoderm (the purple sea urchin) and a mollusk (the black chiton). A number of periodic components with different frequencies, some shown to be genetically anchored, await applications in psychology as well as in other fields of medicine and biology.
Cornélissen
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University of Minnesota, Minneapolis 55455, USA.
Sothern
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Halberg
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Halberg
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D000818:Animals; D001695:Biology / Q000706:statistics & numerical data*; D016001:Confidence Intervals; D006801:Humans; D016018:Least-Squares Analysis; D008962:Models, Theoretical; D010507:Periodicity; D011584:Psychology / Q000706:statistics & numerical data