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Related Experiment Videos

Language lateralization in healthy right-handers.

S Knecht1, M Deppe, B Dräger

  • 1Department of Neurology, University of Münster, Germany. knecht@uni-muenster.de

Brain : a Journal of Neurology
|December 28, 1999
PubMed
Summary

Atypical language dominance in the right hemisphere is more common in healthy right-handed individuals than previously thought. This study found right hemisphere language dominance in 7.5% of subjects, challenging earlier assumptions.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neurolinguistics

Background:

  • Cerebral language lateralization knowledge primarily stems from brain lesion studies, suggesting rare atypical dominance in healthy individuals.
  • Previous assumptions posited exceedingly rare right hemisphere language dominance in healthy, right-handed subjects.

Purpose of the Study:

  • To investigate the prevalence of atypical language lateralization in healthy right-handed individuals.
  • To test the assumption that right hemisphere language dominance is rare in healthy subjects.

Main Methods:

  • Utilized a novel non-invasive quantitative technique to measure language lateralization.
  • Assessed 188 healthy subjects with moderate to strong right-handedness during a word generation task.
  • Determined averaged hemispheric perfusion differences in middle cerebral artery territories.

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Main Results:

  • Language lateralization distribution follows a bimodal continuum.
  • No significant difference in lateralization was observed between men and women.
  • Right hemisphere language dominance was identified in 7.5% of the healthy right-handed subjects.

Conclusions:

  • Atypical language dominance, specifically right hemisphere dominance, is more prevalent in healthy right-handed individuals than previously assumed.
  • The findings suggest a broader spectrum of language lateralization in the healthy brain.