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Hemispheric and facial asymmetry: gender differences.

W M Smith1

  • 1Darmouth College, New Hampshire, USA. William.M.Smith@Dartmouth.edu

Laterality
|October 30, 2004
PubMed
Summary

Facial asymmetry, or facedness, differs between sexes. Females showed right-sided facial dominance, while males exhibited left-sided dominance, linked to hemispheric processing differences.

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Area of Science:

  • Human Anatomy
  • Neuroscience
  • Psychology

Background:

  • Facial asymmetry, termed facedness, is a common human trait.
  • Previous research has explored facial asymmetry, but sex-based differences require further investigation.

Purpose of the Study:

  • To investigate and compare facial asymmetry (facedness) between female and male college students.
  • To explore potential links between facial asymmetry and hemispheric cognitive processing differences.

Main Methods:

  • Quantitative analysis of facial asymmetry using measurements of hemiface sizes from frontal photographs.
  • Comparison of facedness between two groups: 45 female and 45 male undergraduate students.

Main Results:

  • Significant differences in facedness were observed between sexes.
  • Females exhibited a tendency towards right-sided facial dominance (right faced).
  • Males demonstrated a tendency towards left-sided facial dominance (left faced).

Conclusions:

  • Sex-based differences in facial asymmetry are attributed to contralateral hemispheric control and sex-differentiated cognitive processing.
  • Differential muscular development of facial sides, influenced by hemispheric factors, is proposed as the underlying mechanism.
  • Further research is recommended to explore facedness across different age groups.

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