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Related Experiment Videos

Handedness in the NAS/NRC twin study.

D C Ross1, J Jaffe, R L Collins

  • 1New York State Psychiatric Institute, New York, NY 10032, USA.

Laterality
|October 30, 2004
PubMed
Summary
This summary is machine-generated.

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This large twin study found no significant differences in handedness between identical and fraternal twins, suggesting genetics may play a less dominant role than previously thought in determining hand preference.

Area of Science:

  • Human genetics
  • Neuroscience
  • Behavioral science

Background:

  • Hand preference, or handedness, is a complex trait.
  • Twin studies are crucial for understanding the interplay of genetic and environmental factors in human traits.

Purpose of the Study:

  • To investigate the genetic and environmental influences on handedness.
  • To determine if zygosity (identical vs. fraternal twins) affects handedness concordance.

Main Methods:

  • A large-scale survey of hand preference was administered to 973 dizygotic (fraternal) and 1158 monozygotic (identical) male twin pairs.
  • Laterality was assessed based on both direction and consistency of handedness.

Main Results:

  • Significant pairwise concordance for handedness was observed in the total twin group.

Related Experiment Videos

  • Concordance was significant for both consistency and directional factors of handedness.
  • No significant differences in concordance were found between dizygotic and monozygotic twin pairs.

    • Conclusions:

    • While handedness shows familial resemblance, this study indicates that zygosity does not significantly differentiate the degree of this resemblance.
    • The findings suggest that genetic factors alone may not fully explain the observed patterns of handedness, highlighting potential environmental influences.