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Related Experiment Videos

Handedness and language cerebral lateralization.

Eman M Khedr1, Enas Hamed, Anwar Said

  • 1Department of Neurology, The University Hospital, Assiut, Egypt. Emankhedr99@yahoo.com

European Journal of Applied Physiology
|August 13, 2002
PubMed
Summary

Repetitive transcranial magnetic stimulation (rTMS) reveals language dominance in the brain. While most right- and left-handed individuals show left-hemisphere dominance, mixed-handedness frequently involves bilateral representation.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neurolinguistics

Background:

  • Cerebral dominance for language is typically lateralized to the left hemisphere.
  • Handedness influences language lateralization, but studies in diverse handedness groups are limited.

Purpose of the Study:

  • To investigate the relationship between handedness and language cerebral dominance using repetitive transcranial magnetic stimulation (rTMS).
  • To assess language dominance in right-handed, left-handed, and mixed-handed individuals.

Main Methods:

  • Utilized repetitive transcranial magnetic stimulation (rTMS) with a focal magnetic coil to determine language cerebral dominance.
  • Assessed handedness using the Stanley Coren Score in 50 healthy medical students (25 right-handed, 25 left-handed).
  • Categorized participants into strongly right-handed, moderately right-handed, strongly left-handed, moderately left-handed, and ambidextrous groups.

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Main Results:

  • Strongly right-handed subjects predominantly showed left-sided language dominance (87.5%).
  • Strongly left-handed subjects also frequently exhibited left-sided language dominance (73.7%), with some bilateral representation (15.8%).
  • Mixed-handed individuals (moderately right, left, and ambidextrous) frequently displayed bilateral cerebral representation (57%) and less left-sided dominance (43%).

Conclusions:

  • Language lateralization to the left hemisphere is common in both strongly right- and left-handed individuals.
  • Mixed-handedness is associated with a higher prevalence of bilateral language representation.
  • Right-sided language dominance is rare across all handedness groups.