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Reduced frontal cortex efficiency is associated with lower white matter integrity in aging.
Zude Zhu1, Nathan F Johnson1, Chobok Kim2
1Department of Anatomy and Neurobiology.
Cerebral Cortex (New York, N.Y. : 1991)
|August 21, 2013
Summary
Older adults show increased frontal brain activation during cognitive tasks, linked to poorer white matter integrity. This suggests aging impacts frontal cortex efficiency due to white matter changes.
Area of Science:
- Neuroscience
- Cognitive Aging
- Neuroimaging
Background:
- Cognitive task performance often shows increased frontal cortex activation in aging, but the underlying mechanisms are not fully understood.
- White matter (WM) microstructure plays a crucial role in brain function and connectivity.
Purpose of the Study:
- To investigate age-related patterns of frontal brain activation during cognitive tasks.
- To examine the relationship between these activations and white matter microstructure in aging.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to measure brain activity during a task-switching paradigm in younger and older adults.
- Diffusion tensor imaging (DTI) was employed to assess white matter integrity.
Main Results:
- Older adults exhibited increased frontal activation, particularly when performance was poorer.
- Higher frontal activation in older adults correlated with worse behavioral performance across task conditions.
- Reduced white matter integrity in specific frontal regions was associated with lower blood oxygen level-dependent (BOLD) signal magnitudes.
Conclusions:
- Age-related decreases in frontal cortex efficiency are linked to diminished white matter integrity.
- White matter microstructure is a key factor in the functional changes observed in the aging frontal cortex.
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