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Updated: May 12, 2026
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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Fiber tract-driven topographical mapping (FTTM) reveals microstructural relevance for interhemispheric visuomotor
Tilman Schulte1, Mahnaz Maddah, Eva M Müller-Oehring
1SRI International, Neuroscience Program, 333 Ravenswood Ave, Menlo Park, CA 94025, USA. tilman.schulte@sri.com
Neuroimage
|April 10, 2013
Summary
Older adults show reduced integrity in anterior callosal fibers but utilize alternative pathways, including pontine fibers, for interhemispheric integration. This highlights age-related brain plasticity and compensatory mechanisms for visuomotor tasks.
Area of Science:
- Neuroscience
- Neuroimaging
- Aging Research
Background:
- Aging impacts white matter integrity, particularly interhemispheric connections.
- Understanding age-related changes in brain networks is crucial for cognitive function.
- Interhemispheric integration is vital for processing lateralized information.
Purpose of the Study:
- To introduce and validate a novel DTI-based fiber tract-driven topographical mapping (FTTM) approach.
- To map age-related changes in interhemispheric fiber integrity.
- To investigate the functional consequences of these changes on visuomotor performance and interhemispheric integration.
Main Methods:
- Diffusion Tensor Imaging (DTI) for white matter tract analysis.
- Fiber tract-driven topographical mapping (FTTM) for detailed analysis of callosal fibers.
- Functional Magnetic Resonance Imaging (fMRI) to assess neural co-activation.
- Visuomotor tasks measuring interhemispheric transfer time and performance.
Main Results:
- Older adults exhibited lower integrity in anterior callosal fibers compared to posterior ones.
- A dissociation was observed in microstructural-functional associations between age groups.
- Younger adults: genu integrity correlated with transfer time; Older adults: body integrity correlated with transfer time along specific trajectories.
- Older adults showed age-group differences in pontine activation, modulated by response hand, and bilateral processing advantages linked to pontine fiber integrity.
Conclusions:
- Older adults compensate for reduced anterior callosal integrity by recruiting alternative pathways, including subcortical structures like the pons.
- FTTM is effective in revealing spatially specific age-related changes in white matter and their functional impact.
- Compensatory mechanisms involving medial corpus callosum and subcortical pathways may support interhemispheric integration in aging.
