Đề thi VSTEP Reading C1 — The Bilingual Brain (Round 6)

For decades, researchers assumed that the brain's language capacity was largely fixed by adolescence. Recent neuroimaging studies, however, have overturned this long-held view, revealing that bilingual individuals develop measurably different neural architectures compared to their monolingual peers. Functional MRI scans demonstrate that bilingual speakers consistently activate broader networks when switching between languages. This continuous mental exercise appears to strengthen the brain's executive control system, particularly the prefrontal cortex and anterior cingulate cortex. The result is enhanced cognitive flexibility, including improved task-switching ability and greater resistance to distraction. Longitudinal studies suggest these benefits accumulate over time. Older adults who have spoken two languages daily since childhood tend to display symptoms of dementia an average of four to five years later than monolingual counterparts. Scientists caution, however, that correlation does not establish causation: bilingual individuals often differ in education, diet, and socioeconomic status, all of which independently affect brain health. Nevertheless, the converging evidence has prompted educational policymakers in several countries to expand second-language programmes in primary schools. Whether or not bilingualism directly shields the brain from decline, the cognitive demands of managing two linguistic systems clearly leave a lasting imprint on neural organisation.