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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Handedness in infants' tool use.

Lauriane Rat-Fischer1, J Kevin O'Regan, Jacqueline Fagard

  • 1Laboratoire Psychologie de la Perception, UMR 8158, CNRS and Université Paris Descartes 45 rue des Saints-Pères, 75270 Paris Cedex 06, France.

Developmental Psychobiology
|September 6, 2012
PubMed
Summary

Infants

Area of Science:

  • Developmental Psychology
  • Motor Control
  • Cognitive Development

Background:

  • Hand preference, a fundamental aspect of motor asymmetry, emerges early in development.
  • Understanding how infants adapt their tool-use strategies based on hand preference is crucial for cognitive and motor development research.

Purpose of the Study:

  • To investigate the influence of innate hand preference on infants' initial tool selection for grasping.
  • To examine how infants' tool-use strategies evolve with age as they learn a tool's functionality.
  • To determine the interplay between hand preference and age-related learning in tool manipulation.

Main Methods:

  • A cohort of 48 infants aged 16 to 22 months participated in the study.
  • Infants were presented with a rake tool to grasp, enabling retrieval of an out-of-reach toy.
Keywords:
developmenthand preferencetool use

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  • Two conditions were tested: one favoring right-hand use and another facilitating left-hand use for toy retrieval.

    • Main Results:

    • Strong right-hand preference for grasping the rake was observed from 16 months, persisting when it yielded a better outcome.
    • Infants increasingly utilized their left (non-preferred) hand for toy retrieval as they aged, particularly when this strategy was more effective.
    • Younger infants showed greater adherence to hand preference, while older infants demonstrated improved strategic planning in tool use.

    Conclusions:

    • Infant tool grasping is initially guided by established hand preference.
    • With age and experience, infants become more adept at overriding preference for more efficient strategies.
    • This study highlights the dynamic interaction between innate biases and developing cognitive abilities in early tool use.