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Corpus callosum morphology does not depend on hand preference or hemispheric dominance for language
René Westerhausen1, Emma M Karlsson2, Leah Johnstone3
1Department of Psychology, University of Oslo, Oslo, Norway.
Brain Research
|March 17, 2025
Summary
This study investigated corpus callosum morphology in relation to handedness and language dominance. Findings indicate no significant differences in corpus callosum size or thickness based on these factors, challenging previous assumptions about interhemispheric integration needs.
Area of Science:
- Neuroscience
- Human Anatomy
- Cognitive Science
Background:
- Traditionally, the corpus callosum's role in hemispheric lateralization has been linked to handedness.
- However, research on callosal differences related to handedness yields inconsistent results.
- This inconsistency may stem from not considering other lateralized functional modules alongside handedness.
Purpose of the Study:
- To re-examine corpus callosum morphology, considering the interaction between hand preference and language dominance.
- To test the hypothesis that individuals writing with the hand ipsilateral to their language dominant hemisphere show altered callosal morphology due to increased interhemispheric integration needs.
Main Methods:
- Compared corpus callosum morphology (midsagittal surface area and regional thickness) in 220 participants.
- Participants were categorized by writing hand (left vs. right) and language dominance (left vs. right hemisphere) determined via fMRI verbal-fluency task.
- Groups included left-writing/left-language dominant (LW/LLD), right-writing/left-language dominant (RW/LLD), and left-writing/right-language dominant (LW/RLD).
Main Results:
- Statistical analyses revealed no evidence supporting the prediction of altered corpus callosum morphology.
- The study possessed sufficient power to detect even small effects.
- No substantial effects on the midsagittal corpus callosum were found in LW/LLD individuals compared to other groups.
Conclusions:
- The corpus callosum's midsagittal morphology is not substantially affected by the interaction of hand preference and language dominance.
- This finding challenges the traditional assumption that specific combinations of handedness and language lateralization necessitate greater interhemispheric integration reflected in callosal structure.
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