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Related Experiment Videos

Beard vs. forehead, ten years later.

Michel Cabanac1, Heiner Brinnel

  • 1Department of Physiology, Faculty of Medicine, Laval University, Québec, Canada.

American Journal of Human Biology : the Official Journal of the Human Biology Council
|September 5, 2001
PubMed
Summary
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The facial skin areas in men remained proportionally consistent over a decade. This finding supports the theory of selective brain cooling in humans, suggesting developmental patterns mirror evolutionary ones.

Area of Science:

  • Human biology
  • Anthropology
  • Physiology

Background:

  • Previous research in 1988 indicated a proportional relationship between glabrous and hairy facial skin areas in men.
  • Longitudinal studies are crucial for understanding developmental stability and its implications.

Purpose of the Study:

  • To longitudinally validate the previously observed relationship between glabrous and hairy facial skin areas in men.
  • To investigate if developmental patterns (ontogeny) reflect evolutionary patterns (phylogeny).
  • To gather indirect evidence supporting the hypothesis of selective brain cooling in humans.

Main Methods:

  • A cohort of 100 men was initially studied in 1988.
  • 39 of these subjects were re-measured 10-11 years later.
  • Statistical analysis, including correlation and regression, was used to compare the measurements.

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Main Results:

  • A significant correlation between glabrous and hairy facial skin areas was re-established in the longitudinal sample.
  • The regression analysis showed the relationship remained practically identical to the initial findings.
  • The consistency suggests developmental stability over time.

Conclusions:

  • The findings support the hypothesis that ontogeny recapitulates phylogeny in human facial development.
  • The results provide indirect evidence for the role of selective brain cooling in human evolution.
  • Facial skin area proportions are stable over extended periods in adult males.