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How should we test infant handedness?

Jacqueline Fagard1, Sylvie Margules1, Clémence Lopez1

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

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Summary

Infant hand preference is established early, but measurement methods vary. This study found 15 trials are sufficient for reliable infant handedness classification, regardless of the formula used, when including bimanual grasps.

Keywords:
Hand preferencecalculation methodestimationhandedness categoryinfants

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Area of Science:

  • Developmental Psychology
  • Neuroscience
  • Human Motor Control

Background:

  • Infants display hand preference soon after birth.
  • Existing research shows a high number of non-lateralized infants in early months.
  • Inconsistent methodologies in calculating handedness indices and categorizing infants lead to a lack of consensus on prevalence rates.

Purpose of the Study:

  • To establish a reliable and efficient method for assessing infant handedness.
  • To compare different formulae for calculating handedness indices.
  • To determine the optimal number of trials for consistent handedness classification in infants.

Main Methods:

  • Tested 46 infants at 9 and 11 months of age.
  • Administered 34 object grasping trials per infant.
  • Compared results using two common handedness formulae, with and without bimanual grasps.
  • Analyzed data based on varying numbers of trials (5 to 34).

Main Results:

  • The choice of formula did not significantly impact results when bimanual grasps were included.
  • A minimum of 15 trials is required for reliable classification of infant handedness.
  • Increasing trials beyond 15 did not yield substantial additional reliable information.

Conclusions:

  • A standardized method incorporating bimanual grasps and 15 trials provides reliable infant handedness assessment.
  • This efficient protocol can be integrated with other developmental evaluations.
  • Further research may refine understanding of early hand preference development.