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Area of Science:

  • Neurology
  • Neuroimaging
  • Cognitive Science

Background:

  • Ischemic white matter hyperintensities (WMH) volume changes on MRI correlate with cognitive decline.
  • The study investigates WMH-normalized volume threshold effects on cognitive performance.
  • It also examines differences between deep white matter hyperintensities (DWMH) and periventricular white matter hyperintensities (PVWMH) effects on cognition.

Purpose of the Study:

  • To determine if changes in WMH volume over time exhibit threshold effects on cognitive decline.
  • To compare the impact of DWMH versus PVWMH on cognitive performance over time.
  • To identify specific volume thresholds associated with accelerated cognitive decline.

Main Methods:

  • Longitudinal study of 339 participants with brain MRI and neuropsychological testing over 13 years.
  • WMH classified as PVWMH or DWMH.
  • Two-segment linear spline regression models identified cognitive decline acceleration thresholds.

Main Results:

  • Cognitive decline in motor function and processing speed accelerated beyond WMH volume thresholds.
  • PVWMH showed larger effects on cognitive decline than DWMH, especially for motor and processing speed.
  • Paradoxical positive associations were observed for the Digit Symbol Substitution Test below thresholds, reversing to decline above.

Conclusions:

  • WMH volume changes have nonlinear, threshold-dependent effects on cognitive performance.
  • Cognitive decline accelerates significantly once WMH volume exceeds certain thresholds.
  • PVWMH exert a more substantial influence on cognitive decline compared to DWMH.