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Regional brain changes in aging healthy adults: general trends, individual differences and modifiers
Naftali Raz1, Ulman Lindenberger, Karen M Rodrigue
1Department of Psychology and Institute of Gerontology, Wayne State University, 87 East Ferry St, 226 Knapp Building, Detroit, MI 48202, USA. nraz@wayne.edu
Cerebral Cortex (New York, N.Y. : 1991)
|February 11, 2005
Summary
Longitudinal brain scans reveal significant shrinkage in key regions like the hippocampus and cerebellum in healthy adults. These age-related brain volume changes, particularly in hypertensive individuals, are more pronounced than previously estimated.
Area of Science:
- Neuroscience
- Gerontology
- Medical Imaging
Background:
- Cross-sectional studies are the primary method for understanding brain aging, inferring changes from age differences.
- Longitudinal studies offer a more accurate assessment of true age-related brain volume changes.
- Previous research has not fully captured the nuances of regional brain volume changes over time.
Purpose of the Study:
- To present longitudinal measures of five-year changes in regional brain volumes in healthy adults.
- To assess average and individual differences in brain volume changes.
- To investigate the effects of age, sex, and hypertension on these changes.
Main Methods:
- Latent difference score modeling was employed to analyze longitudinal data.
- Five-year changes in regional brain volumes were tracked in healthy adults.
- Effects of age, sex, and hypertension on brain volume changes were statistically evaluated.
Main Results:
- Substantial shrinkage was observed in the caudate, cerebellum, hippocampus, and association cortices.
- Longitudinal estimates of brain shrinkage were greater than cross-sectional estimates.
- Shrinkage accelerated with age in the hippocampus and cerebellum, particularly in hypertensive participants.
Conclusions:
- Longitudinal assessment provides a more accurate picture of brain aging than cross-sectional studies.
- Brain shrinkage patterns vary with age and are influenced by factors like hypertension.
- Individual differences in brain volume change suggest common underlying causes, but no neuroprotective effects of brain size or education were found.