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Structure-Function Dissociations of Human Hippocampal Subfield Stiffness and Memory Performance.
Peyton L Delgorio1, Lucy V Hiscox1, Ana M Daugherty2
1Department of Biomedical Engineering, University of Delaware, Newark, Delaware 19716.
Summary
Stiffness in specific hippocampal subfields, measured by magnetic resonance elastography (MRE), correlates with memory performance across the lifespan. This technique may serve as a biomarker for brain health in aging and neurodegenerative diseases.
Area of Science:
- Neuroscience
- Medical Imaging
- Gerontology
Background:
- Aging and neurodegenerative diseases impair cognitive functions, particularly memory.
- Hippocampal subfields (HCsf) are crucial for memory, with distinct roles in processing.
- Understanding HCsf microstructure-function links is vital for assessing brain health vulnerability.
Purpose of the Study:
- To investigate associations between hippocampal subfield stiffness and cognitive domains across adulthood.
- To determine if HCsf viscoelasticity mediates the relationship between aging and memory performance.
- To explore the potential of magnetic resonance elastography (MRE) as a biomarker for cognitive aging.
Main Methods:
- Magnetic Resonance Elastography (MRE) was used to quantitatively assess tissue viscoelasticity.
- Eighty-eight adult participants (23-81 years) underwent MRE and cognitive assessments.
- Correlations between HCsf stiffness and memory performance outcomes were analyzed.
Main Results:
- Cornu ammonis 1-2 (CA1-CA2) stiffness correlated with verbal memory interference cost and relational memory performance.
- CA1-CA2 stiffness mediated the relationship between age and verbal memory interference cost.
- Dentate gyrus-cornu ammonis 3 (DG-CA3) and subiculum (SUB) stiffness associated with delayed verbal recall.
Conclusions:
- HCsf stiffness is linked to specific memory functions, supporting their functional specialization.
- MRE measures of HCsf stiffness show potential as clinical biomarkers for brain health.
- These findings highlight MRE's utility in assessing cognitive integrity in aging and disease.
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