Language skills stay strong in older adults, even while other cognitive abilities decline
MIT researchers find that activity in the brain’s language network is nearly identical in young and old people.
People's cognitive abilities often decline with age, particularly in brain networks involved in executive functions like decision-making. However, language skills tend to remain strong or even improve as individuals gain vocabulary throughout their lives. A new brain imaging study from MIT-Boston University reveals the neural activity underlying this phenomenon.
The researchers found that the language processing network in older adults was nearly identical to that of younger adults during language tasks, while the multiple demand network, responsible for executive control tasks, showed decline across measures in older adults. Anne Billot, a lead author of the study, explains that the language network remained nearly unchanged in older and younger groups, while the executive system exhibited reduced activation and synchronization.
This suggests that language processing areas may be more resilient to aging than general-purpose networks that have greater flexibility. The study, published in Nature Communications, involved comparing brain activity in two groups: ages 17-39 and 41-80. The researchers concluded that specialized language processing areas may be less susceptible to age-related decline compared to the more flexible multiple demand network.
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