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Cortical collateralization induced by language and arithmetic in non-right-handers
1Center for Information and Neural Networks (CiNet), National Institute of Information and Communication Technology, Osaka University, Osaka, Japan; The University of Tokyo, Graduate School of Arts and Sciences, Tokyo, Japan; National Rehabilitation Center For Persons with Disabilities, Saitama, Japan.
Language and arithmetic share brain activity, particularly in the inferior frontal gyrus (IFG). This study in non-right-handed individuals reveals correlated brain lateralization for both language and arithmetic tasks.
Area of Science:
- Neuroscience
- Cognitive Science
- Psycholinguistics
Background:
- The relationship between language and arithmetic processing in the brain remains debated.
- Some research indicates independent neural representations, while others suggest shared activity, particularly in the inferior frontal gyrus (IFG).
- Most prior studies focused on right-handed individuals, overlooking potential insights from non-right-handed individuals regarding functional overlap.
Purpose of the Study:
- To investigate the cortical lateralization patterns of language and arithmetic tasks.
- To explore the functional overlap and correlation of brain activity between these two cognitive domains in non-right-handed individuals.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed.
- Thirty non-right-handed participants completed both language and arithmetic tasks.
- Cortical lateralization patterns and their correlations were analyzed.
Main Results:
- Shared brain activity for language and arithmetic tasks was observed in the bilateral inferior frontal gyrus (IFG).
- A significant correlation was found between the lateralization patterns of language and arithmetic tasks.
- The precentral gyrus showed the highest correlation in laterality indices between the two tasks.
Conclusions:
- The findings suggest a shared functional property between language and arithmetic processing in the brain.
- Hemispheric dominance for language and arithmetic is linked, especially in non-right-handed individuals.
- This shared neural basis may involve regions like the inferior frontal gyrus and precentral gyrus.
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