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Younger adults show greater brain signal variability (SDBOLD) than older adults. This difference in dynamic brain function persists even after accounting for vascular factors, highlighting SDBOLD as a key aging brain marker.

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Area of Science:

  • Neuroscience
  • Aging Brain Research
  • Neuroimaging

Background:

  • Studies indicate younger adults have higher blood oxygen level-dependent (BOLD) signal variability (SDBOLD) in cortical regions.
  • This suggests the aging brain may experience a reduced dynamic range, but the physiological basis is unclear.

Purpose of the Study:

  • To investigate the physiological underpinnings of age-related differences in SDBOLD.
  • To determine if vascular factors contribute to reduced SDBOLD in older adults.

Main Methods:

  • Used a dual-echo BOLD/pseudo-continuous arterial spin labeling (pCASL) sequence in 29 younger and 45 older adults.
  • Employed hypercapnia via controlled gas delivery to assess cerebrovascular reactivity (CVR).
  • Statistically controlled for cerebral blood flow (CBF) and maximum BOLD signal change (M).

Main Results:

  • Younger adults consistently exhibited higher SDBOLD across brain regions.
  • Age differences in SDBOLD remained significant even after controlling for vascular factors like CBF and CVR.
  • This suggests vascular contributions do not fully explain the observed age-related decline in dynamic brain signaling.

Conclusions:

  • BOLD signal variability (SDBOLD) is a robust indicator of brain aging.
  • Age-related reductions in brain signal dynamics are not solely explained by vascular mechanisms.
  • SDBOLD serves as a crucial marker for understanding the aging brain.