The Claim
Later age of second language acquisition is associated with greater volume and cortical surface area in the right pars orbitalis of the inferior frontal gyrus in bilingual adults.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Adults who learned a second language later in life have larger volume and greater cortical surface area in a specific region of the right frontal brain area compared to those who learned earlier.
See the scientific wording
Later age of second language acquisition is associated with greater volume and cortical surface area in the right pars orbitalis of the inferior frontal gyrus in bilingual adults, suggesting that late learners may rely more on higher-order semantic processing regions.
When a second language is learned later in life, the brain cannot use early-developing regions for automatic language processing, so it relies more on areas that manage meaning and word selection. Repeated use of these meaning-focused regions causes them to grow larger over time, resulting in thicker tissue and more surface area in a specific part of the right frontal lobe.
What the research says
1 studyStudy: How age of acquisition influences brain architecture in bilinguals
The study found that later age of acquisition correlated with increased volume and surface area in the right pars orbitalis, even though no single factor (AoA, proficiency, exposure) independently predicted it, suggesting a complex interaction favoring recruitment of this region in late learners.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
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