Effects of Global Atrophy, White Matter Lesions, and Cerebral Blood Flow on Age-Related Changes in Speed, Memory, Intelligence, Vocabulary, and Frontal Function

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Patrick Rabbitt
  • Oemetse Mogapi
  • Marietta Scott
  • Christine Lowe
  • Mike Horan
  • Neil Pendleton
  • Dan Lunn

Abstract

Brain images were obtained from 133 healthy people of ages 61-85 years who completed 20 tests of information processing speed, intelligence, frontal and executive function, memory, and vocabulary. Structural equation models examined relationships between cognitive test scores, ages and measurements of global age-associated atrophy, white matter lesions, and cerebral blood flow. These neurophysiological measures jointly account for all age-related variance in information processing speed. Speed entirely mediated relationships between neurophysiological measures and memory and partly mediated relationships between neurophysiological measures and intelligence and frontal function. Neurophysiological measures, but not calendar age, accounted for vocabulary scores. Cognitive slowing was responsible for some, but not all, age-related declines in mental function. Age-related declines in intelligence, frontal function, and speed were due to changes in different functional systems. © 2007 American Psychological Association.

Bibliographical metadata

Original languageEnglish
Pages (from-to)684-695
Number of pages11
JournalNeuropsychology
Volume21
Issue number6
DOIs
Publication statusPublished - Nov 2007