There are neural differences among monolingual and bilingual speakers depending on when the second language was learned.

Question

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Research has found that bilingualism can lead to neural differences in various brain areas depending on the age of second language acquisition. For example, bilinguals who acquired their second language early in life tend to have more gray matter in the parietal and frontal lobes, while bilinguals who learned their second language later in life tend to have more gray matter in the anterior cingulate cortex and basal ganglia. These differences suggest that the neural effects of bilingualism may be modulated by critical periods of brain development.

There Are Neural Differences Among Monolingual and Bilingual Speakers Depending