Dataset Information

Executive control function, brain activation and white matter hyperintensities in older adults.

ABSTRACT:

Context

Older adults responding to executive control function (ECF) tasks show greater brain activation on functional MRI (fMRI). It is not clear whether greater fMRI activation indicates a strategy to compensate for underlying brain structural abnormalities while maintaining higher performance.

Objective

To identify the patterns of fMRI activation in relationship with ECF performance and with brain structural abnormalities.

Design

Cross-sectional analysis.

Main variables of interest

fMRI activation, accuracy while performing an ECF task (Digit Symbol Substitution Test), and volume of white matter hyperintensities and of total brain atrophy.

Setting

Cohort of community-dwelling older adults.

Participants

Data were obtained on 25 older adults (20 women, 81 years mean age).

Outcome measure

Accuracy (number of correct response/total number of responses) while performing the Digit Symbol Substitution Test.

Results

Greater accuracy was significantly associated with greater peak fMRI activation, from ECF regions, including left middle frontal gyrus and right posterior parietal cortex. Greater WMH was associated with lower activation within accuracy-related regions. The interaction of accuracy by white matter hyperintensity volume was significant within the left posterior parietal region. Specifically, the correlation of white matter hyperintensity volume with fMRI activation varied as a function of accuracy and it was positive for greater accuracy. Associations with brain atrophy were not significant.

Conclusions

Recruitment of additional areas and overall greater brain activation in older adults is associated with higher performance. Posterior parietal activation may be particularly important to maintain higher accuracy in the presence of underlying brain connectivity structural abnormalities.

SUBMITTER: Venkatraman VK

PROVIDER: S-EPMC2818521 | biostudies-literature | 2010 Feb

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Executive control function, brain activation and white matter hyperintensities in older adults.

Venkatraman Vijay K VK Aizenstein Howard H Guralnik Jack J Newman Anne B AB Glynn Nancy W NW Taylor Christopher C Studenski Stephanie S Launer Lenore L Pahor Marco M Williamson Jeff J Rosano Caterina C Rosano Caterina C

NeuroImage 20091114 4

<h4>Context</h4>Older adults responding to executive control function (ECF) tasks show greater brain activation on functional MRI (fMRI). It is not clear whether greater fMRI activation indicates a strategy to compensate for underlying brain structural abnormalities while maintaining higher performance.<h4>Objective</h4>To identify the patterns of fMRI activation in relationship with ECF performance and with brain structural abnormalities.<h4>Design</h4>Cross-sectional analysis.<h4>Main variable ...[more]

PMID: 19922803

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Project description:Frontal lobe structures decline faster than most other brain regions in older adults. Age-related change in the frontal lobe is associated with poorer executive function (e.g., working memory, switching/set-shifting, and inhibitory control). The effects and presence of frontal lobe white matter hyperintensities (WMH) on executive function in normal aging is relatively unknown. The current study assessed relationships between region-specific frontal WMH load and cognitive performance in healthy older adults using three executive function tasks from the NIH Toolbox (NIHTB) Cognition Battery. A cohort of 279 healthy older adults ages 65-88 completed NIHTB and 3T T1-weighted and FLAIR MRI. Lesion Segmentation Toolbox quantified WMH volume and generated lesion probability maps. Individual lesion maps were registered to the Desikan-Killiany atlas in FreeSurfer 6.0 to define regions of interest (ROI). Independent linear regressions assessed relationships between executive function performance and region-specific WMH in frontal lobe ROIs. All models included age, sex, education, estimated total intracranial volume, multi-site scanner differences, and cardiovascular disease risk using Framingham criteria as covariates. Poorer set-shifting performance was associated with greater WMH load in three frontal ROIs including bilateral superior frontal (left β = -0.18, FDR-p = 0.02; right β = -0.20, FDR-p = 0.01) and right medial orbitofrontal (β = -0.17, FDR-p = 0.02). Poorer inhibitory performance associated with higher WMH load in one frontal ROI, the right superior frontal (right β = -0.21, FDR-p = 0.01). There were no significant associations between working memory and WMH in frontal ROIs. Our study demonstrates that location and pattern of frontal WMH may be important to assess when examining age-related differences in cognitive functions involving switching/set-shifting and inhibition. On the other hand, working memory performance was not related to presence of frontal WMH in this sample. These data suggest that WMH may contribute selectively to age-related declines in executive function. Findings emerged beyond predictors known to be associated with WMH presence, including age and cardiovascular disease risk. The spread of WMH within the frontal lobes may play a key role in the neuropsychological profile of cognitive aging. Further research should explore whether early intervention on modifiable vascular factors or cognitive interventions targeted for executive abilities may help mitigate the effect of frontal WMH on executive function.

Dataset Information

Executive control function, brain activation and white matter hyperintensities in older adults.

Context

Objective

Design

Main variables of interest

Setting

Participants

Outcome measure

Results

Conclusions

Publications

Executive control function, brain activation and white matter hyperintensities in older adults.

Similar Datasets

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