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Related Experiment Videos

Eye-dominance, writing hand, and throwing hand.

I C McManus1, C Porac, M P Bryden

  • 1Dept. of Psychology, University College London, UK.

Laterality
|October 30, 2004
PubMed
Summary

Handedness and eye dominance are linked, but the relationship is complex. Dividing individuals into consistent and inconsistent handers based on writing and throwing hands clarifies this association, showing eyedness is secondary to handedness.

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Area of Science:

  • Neuroscience
  • Human Biology
  • Behavioral Science

Background:

  • Handedness and eye dominance show statistical associations, but previous models struggle to explain asymmetric distributions.
  • Existing research indicates approximately 35% of right-handers and 57% of left-handers are left-eye dominant.

Purpose of the Study:

  • To investigate if differentiating between consistent and inconsistent handers clarifies the relationship between handedness and eye dominance.
  • To determine the independent and combined influences of writing hand and throwing hand on eye dominance.

Main Methods:

  • Analysis of questionnaire data from 10,635 subjects.
  • Categorization of participants into consistent (writing and throwing with the same hand) and inconsistent (writing and throwing with opposite hands) handers.

Related Experiment Videos

  • Statistical examination of the association between handedness categories and eye dominance.

    • Main Results:

    • 28.8% of left-handers and 1.6% of right-handers were identified as inconsistent in throwing.
    • Both writing and throwing hands independently relate to eye dominance, with throwing hand showing a stronger association.
    • The asymmetry in eye dominance distribution was resolved when considering handedness consistency.

    Conclusions:

    • Eye dominance is phenotypically secondary to writing and throwing handedness.
    • Evidence suggests writing and throwing hands are co-inherited, and eye dominance runs in families.
    • Further research is needed to model the complex associations between handedness, eye dominance, footedness, and language dominance.