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Behavioral Assessment of Manual Dexterity in Non-Human Primates
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How should "ambidexterity" be estimated?

Jacqueline Fagard1, Amandine Chapelain, Philippe Bonnet

  • 1a Laboratoire Psychologie de la Perception , Université Paris Descartes (UMR 8242) , Paris , France.

Laterality
|February 11, 2015
PubMed
Summary

Establishing consistent criteria for classifying hand preference is crucial for understanding its links to development and cognition. This study defines clear categories for ambidextrous, mixed, and strong handedness, aiding future research consistency.

Keywords:
AmbidexterityFamily handednessGenderMeasurementMixed-handedness

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Human Behavior

Background:

  • Hand preference variations are linked to developmental disorders and cognitive function.
  • Inconsistent definitions of ambidexterity and mixed-handedness hinder research comparability.
  • A standardized classification system is needed for reliable handedness research.

Purpose of the Study:

  • To establish clear criteria for classifying individuals into distinct handedness categories: ambidextrous, mixed, and strong right- or left-handed.
  • To compare questionnaire-based handedness classifications with laterality index (LI) cut-offs.
  • To facilitate systematic comparison of findings across handedness studies.

Main Methods:

  • Administered a handedness questionnaire to 716 participants.
  • Utilized multiple correspondence analyses to define initial handedness groups.
  • Compared questionnaire-derived categories with laterality index (LI) classifications using various thresholds.

Main Results:

  • Identified specific prevalence rates: 3.3% ambidextrous, 29.2% mixed right-handed, 56% strong right-handed, 9.1% mixed left-handed, and 2.4% strong left-handed.
  • Found strong correlation between questionnaire-based categories and LI cut-offs at -90, -30, +30, and +90.
  • Defined clear LI ranges for strong left-handedness (< -90), mixed left-handedness (-90 to -30), ambidexterity (-30 to +30), mixed right-handedness (+30 to +90), and strong right-handedness (> +90).

Conclusions:

  • The proposed LI cut-offs provide a reliable and standardized method for classifying handedness.
  • Standardized classification enhances the comparability of research on handedness and its associations.
  • Further research can now systematically compare characteristics of individuals across these defined handedness categories.