The relationship between bilingual experience and gyrification in adulthood: A cross-sectional surface-based...

Area of Science:

• Neuroimaging
• Cognitive Neuroscience
• Neuroplasticity

Background:

• Bilingualism is linked to neural plasticity, but research often overlooks neurostructural changes beyond gray matter and white matter.
• Cortical gyrification, a measure of brain surface folding, offers insights into developmental, aging, and disease-related brain changes.
• Previous studies have not fully explored the impact of bilingualism on gyrification across the adult lifespan.

Purpose of the Study:

• To investigate the effect of bilingual experience on cortical gyrification from early adulthood to old age.
• To identify specific brain regions where bilingualism might influence gyrification.
• To understand how bilingualism-related neural plasticity manifests in cortical folding patterns.

Main Methods:

• Utilized Surface-based Morphometry (SBM) to analyze gyrification patterns.
• Compared gyrification in a sample of bilingual individuals and monolingual controls.
• Examined age-related changes in cortical folding across the adult lifespan.

Main Results:

• Observed widespread reductions in cortical folding with increasing age in all participants.
• Detected preserved gyrification in bilinguals within the right cingulate and entorhinal cortices.
• Identified these preserved regions as areas susceptible to normal and pathological brain aging.

Conclusions:

• Bilingualism is associated with preserved gyrification in specific brain regions, suggesting experience-related cortical reshaping.
• These findings provide novel evidence for bilingualism-induced cortical plasticity in adulthood.
• The study contributes to understanding how lifelong bilingualism impacts brain structure and aging.