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Structural asymmetry of anterior insula: behavioral correlates and individual differences
Christine Chiarello1, David Vazquez, Adam Felton
1Department of Psychology, University of California, Riverside, Riverside CA 92521, USA. christine.chiarello@ucr.edu
Brain and Language
|May 18, 2013
Summary
Structural brain asymmetry in the anterior insula is linked to visual word recognition in young adults. Hand preference consistency influences this relationship, suggesting the insula
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Developmental Neuroscience
Background:
- Structural asymmetry in language regions is well-documented.
- The insula's role in language and its structural lateralization remain less understood.
- Previous research suggests the insula contributes to language processing.
Purpose of the Study:
- To investigate the relationship between structural asymmetry of the insula and traditional language regions.
- To examine the association between insular asymmetry and visual word recognition.
- To explore how hand preference consistency modulates these relationships.
Main Methods:
- Neuroimaging analysis of cortical surface area in 200 young adults.
- Divided visual field (DVF) technique for assessing visual word recognition lateralization.
- Statistical analyses correlating structural and behavioral measures.
Main Results:
- Significant leftward surface area asymmetry was found in the anterior insula.
- Anterior insula asymmetry correlated with lateralization of visual word recognition.
- The association between structural and linguistic asymmetry was modulated by hand preference consistency.
- Other language regions (pars opercularis, triangularis, planum temporale) showed asymmetry but not association with word recognition.
Conclusions:
- Leftward structural asymmetry of the anterior insula is behaviorally relevant for language.
- The insula may play a role in bootstrapping language network lateralization.
- Early developing insular cortex might influence later functional lateralization in language.
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