Preserved topography, lateralization, selectivity, and functional connectivity of the language network in older brains.
Level 4 - case-series / case-control
Cross-sectional cohort comparison (CEBM level 4 by design analogy).
PubMed 42637780 · doi:10.1038/s41467-026-76598-x
What was done
Precision functional magnetic resonance imaging (fMRI) was used to compare the language-selective network and the Multiple Demand (MD) network between older adults (N = 64) and young controls (N = 483). Researchers assessed response strength, spatial extent, topographical variability, hemispheric lateralization, and within-network functional connectivity during comprehension and executive function tasks.
What was found
The abstract reports no numerical values or effect sizes. Older adults exhibited weaker, less spatially extensive, more topographically variable activation, and reduced functional connectivity in the MD network during executive tasks. In contrast, the language network in older adults showed preserved activation strength, selectivity, left-hemispheric lateralization, and within-network functional connectivity comparable to younger adults.
Why it matters
This study provides a functional neuroimaging basis for why language comprehension remains resilient during healthy aging while executive functions decline, showing that cognitive aging reflects network-selective rather than uniform brain changes.
Limits
The abstract provides no exact quantitative metrics, p-values, or confidence intervals. The cross-sectional design cannot establish within-individual longitudinal trajectories, and there is a large sample size disparity between older (N = 64) and younger (N = 483) cohorts.
Cited by
- supports Language centers of the human brain are localized in the left hemisphere.