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White matter lesions account for all age-related declines in speed but not in intelligence

Patrick Rabbitt1, Marietta Scott, Mary Lunn

  • 1Department of Psychology, University of Manchester, Manchester, United Kingdom. patrick.rabbitt@psy.ox.ac.uk

Neuropsychology
|May 9, 2007
PubMed

Insights

White matter lesion prevalence (WMLP) in older adults significantly impacts cognitive functions like processing speed and executive abilities. However, WMLP does not affect general fluid intelligence, challenging previous assumptions about brain aging and cognition.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • White matter lesions (WMLs) are common in aging brains and linked to cognitive decline.
  • Previous research suggested brain changes universally impact cognitive abilities through processing speed.

Purpose of the Study:

  • To investigate the relationship between white matter lesion prevalence (WMLP) and cognitive performance in older adults.
  • To determine if WMLP explains age-related cognitive variance and to test existing hypotheses on brain aging and cognition.

Main Methods:

  • MRI scans assessed WMLP in 65 individuals aged 65-84.
  • Participants completed 17 cognitive tests covering fluid intelligence, vocabulary, memory, processing speed, and executive function.
  • Regression analyses examined age and WMLP as predictors of cognitive test scores.

Main Results:

  • WMLP accounted for all age-related variance in processing speed and executive function tests.
  • WMLP did not account for any age-related variance in general fluid intelligence.
  • Simple correlations between age and cognitive function can be misleading; WMLP is a crucial factor.

Conclusions:

  • WMLP significantly influences specific cognitive domains (speed, executive function) in aging.
  • The impact of gross brain changes on cognitive abilities is domain-specific, not solely mediated by processing speed.
  • Findings revise hypotheses suggesting universal cognitive impairment from brain aging markers.

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