Older age linked to less persistent human brain activity
A measure of brain activity’s persistence shortened from about 29 milliseconds in childhood to 9 milliseconds in late adulthood.
Our read
Mechanisms- Studied:
- Preprint: cross-sectional study of 1,156 people
- Why it’s aging research:
- It looks at how biology varies with age or lifespan.
Editor of record: Boris Djordjevic · AgingResearch.News
Brain recordings from 1,156 people aged 6 to 88 in three independent cohorts were examined in an observational analysis of activity persistence in the cortex, the brain’s outer layer. The researchers used magnetoencephalography, which records magnetic signals from brain activity, while participants rested.
Activity was less persistent at older ages, with the steepest decline before age 30. This pattern appeared in every cortical region and all three cohorts. Alpha oscillations, a type of rhythmic brain activity, followed a different pattern: their frequency peaked in early adulthood, then declined after midlife. Computer models linked shorter persistence to stronger inhibition, or suppression of activity, within the thalamus, a brain region. Longer signal travel times partly accounted for alpha slowing in the models.
Why it matters
Persistent brain activity helps the brain integrate information over time. Mapping its timing across life addresses how this process is organized during development and aging.
Caveats
The model-based links to inhibition and signal travel times do not show that these mechanisms caused the age-related patterns in people. The preprint has not been peer-reviewed.
Where the evidence stands
Synaptic transmission
- 109 independent labs in 29 countries
- 3 findings against
- Funders: National Institutes of Health and others
- 10 of 142 findings with company ties
The paper
Distinct lifespan trajectories of cortical intrinsic timescales and neural oscillations
McGill University
bioRxiv, Nov 6, 2026, Open access, CC BY, Preprint, not yet peer-reviewed
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