The default mode network (DMN) — the set of brain regions that activate during mind-wandering and self-referential thought — is increasingly implicated in cognitive aging trajectories and depression risk.
Structural Changes at 8 Weeks
- Prefrontal cortex gray matter density increased 4.2% in meditation group vs. 0.3% control (p=0.001)
- Posterior cingulate cortex thickness reduced — associated with decreased mind-wandering
- Resting HRV increased by 8.4 ms in meditation group vs. 1.2 ms control
What This Means for Longevity
Prefrontal cortex volume loss is one of the earliest markers of cognitive aging. An intervention that demonstrably reverses or slows this loss over 8 weeks — with no pharmacological intervention — represents one of the highest evidence-to-accessibility ratios in the longevity toolkit.
