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Hum Brain Mapp. 2015 Dec;36(12):4910-25. doi: 10.1002/hbm.22959. Epub 2015 Sep 7.

Brain volumetric changes and cognitive ageing during the eighth decade of life.

Author information

1
Department of Psychology, the University of Edinburgh, Edinburgh, EH8 9JZ, United Kingdom.
2
Centre for Cognitive Ageing and Cognitive Epidemiology, the University of Edinburgh, Edinburgh, EH8 9JZ, United Kingdom.
3
Neuroimaging Sciences, Brain Research Imaging Centre, the University of Edinburgh, Edinburgh, EH4 2XU, United Kingdom.
4
Scottish Imaging Network, a Platform for Scientific Excellence (SINAPSE) Collaboration.
5
Centre for Clinical Brain Sciences, the University of Edinburgh, Edinburgh, EH16 4TJ, United Kingdom.
6
Computer Science Department, Faculty of Science, Lagos State University, Lagos, PMB 001, Nigeria.
7
Alzheimer Scotland Dementia Research Centre, the University of Edinburgh, Edinburgh, EH8 9JZ, United Kingdom.
8
Department of Psychology, Heriot-Watt University, Edinburgh, EH14 4AS, United Kingdom.

Abstract

Later-life changes in brain tissue volumes--decreases in the volume of healthy grey and white matter and increases in the volume of white matter hyperintensities (WMH)--are strong candidates to explain some of the variation in ageing-related cognitive decline. We assessed fluid intelligence, memory, processing speed, and brain volumes (from structural MRI) at mean age 73 years, and at mean age 76 in a narrow-age sample of older individuals (n = 657 with brain volumetric data at the initial wave, n = 465 at follow-up). We used latent variable modeling to extract error-free cognitive levels and slopes. Initial levels of cognitive ability were predictive of subsequent brain tissue volume changes. Initial brain volumes were not predictive of subsequent cognitive changes. Brain volume changes, especially increases in WMH, were associated with declines in each of the cognitive abilities. All statistically significant results were modest in size (absolute r-values ranged from 0.114 to 0.334). These results build a comprehensive picture of macrostructural brain volume changes and declines in important cognitive faculties during the eighth decade of life.

KEYWORDS:

age-related cognitive decline; brain volume; longitudinal study; structural MRI; white matter hyperintensities

PMID:
26769551
PMCID:
PMC4832269
DOI:
10.1002/hbm.22959
[Indexed for MEDLINE]
Free PMC Article

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