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Neural Coupling between Interhemispheric and Frontoparietal Functional Connectivity during Semantic Processing.
1Department of English Language Studies, Faculty of Foreign Language Studies, Mejiro University, Shinjyuku, Tokyo 161-8539, Japan.
Brain Sciences
|November 25, 2023
Summary
Explicit semantic processing enhances neural coupling between right temporal areas and frontoparietal functional connectivity. This interaction, observed in later processing stages, supports the neural coupling hypothesis for semantic tasks.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Psycholinguistics
Background:
- Interhemispheric and frontoparietal functional connectivity increase during explicit information processing.
- The interaction between these connectivity patterns during explicit semantic processing remains unclear.
Purpose of the Study:
- To test the neural coupling hypothesis: explicit semantic processing enhances right hemispheric activity.
- To investigate the synchronization of right hemispheric activity with frontoparietal functional connectivity.
- To determine the temporal dynamics of these interactions during semantic processing.
Main Methods:
- Analysis of electroencephalogram (EEG) data using a semantic priming paradigm.
- Visual stimuli (priming and target words) presented under direct or indirect attention.
- Methods included scalp potential analysis, current source density analysis, dynamic functional connectivity, and neural coupling analysis.
Main Results:
- Explicit processing of congruent targets reduced negative event-related potentials.
- Right temporal areas were activated during later temporal intervals of explicit semantic processing.
- Explicit semantic processing enhanced correlation between right temporal source activity and frontoparietal functional connectivity in later stages.
Conclusions:
- Explicit semantic processing strengthens neural coupling between interhemispheric and frontoparietal functional connectivity.
- This coupling primarily occurs during later processing stages, supporting right hemispheric involvement.
- Findings provide evidence for the neural coupling hypothesis in explicit semantic cognition.
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