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Lateralization01:28

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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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Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
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Left handedness does not extend to visually guided precision grasping.

Claudia L R Gonzalez1, R L Whitwell, B Morrissey

  • 1CIHR Group on Action and Perception, Department of Psychology, University of Western Ontario, London, Canada N6A 5C2. cgonzal6@uwo.ca

Experimental Brain Research
|August 25, 2007
PubMed
Summary

Left-handed individuals show less hand preference in natural grasping tasks compared to right-handed individuals. This suggests right-handedness in visuomotor control might be a universal left-hemisphere specialization.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Motor Control

Background:

  • Hand preference, or handedness, is a well-documented phenomenon in humans.
  • The neural basis of handedness, particularly visuomotor control, is a subject of ongoing research.
  • Previous studies have explored hand preference in various tasks, but naturalistic grasping behaviors require further investigation.

Purpose of the Study:

  • To measure spontaneous hand preference during a natural grasping task.
  • To compare hand preference in right-handed and left-handed individuals.
  • To investigate the role of the dominant hand in visuomotor control for different handedness groups.

Main Methods:

  • Participants (right- and left-handed) were instructed to assemble puzzles or LEGO models.
  • Hand movements were videotaped to measure spontaneous hand preference for grasping.
  • Grasping in ipsilateral and contralateral space was analyzed to assess hand use.

Main Results:

  • Right-handed subjects showed a strong preference for using their dominant hand.
  • Left-handed subjects exhibited no marked preference, using their right hand 50% of the time.
  • Left-handers utilized their non-dominant hand more frequently than right-handers in both ipsilateral and contralateral space.

Conclusions:

  • Handedness in left-handers does not consistently extend to precision grasping tasks.
  • The findings suggest a potential universal left-hemisphere specialization for right-handed visuomotor control.
  • This study highlights differences in motor control strategies between right- and left-handed individuals during naturalistic tasks.