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Hearing Function Moderates Age-Related Differences in Brain Morphometry in the HCP Aging Cohort.

Robert M Kirschen¹, Amber M Leaver¹

¹Department of Radiology, Northwestern University, Chicago, Illinois, USA.

Human Brain Mapping

|November 14, 2024

Summary

Hearing loss is linked to accelerated brain aging, particularly in sensory regions and brain ventricles. Protecting hearing may help reduce age-related neurodegeneration.

Keywords:

aging hearing loss morphometry temporal cortex

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Area of Science:

Neuroscience
Aging Research
Audiology

Background:

Aging is associated with neurodegeneration and hearing loss.
The relationship between structural brain aging and hearing loss requires further investigation.

Purpose of the Study:

To investigate how hearing loss influences structural brain aging.
To identify specific brain regions affected by the interaction of aging and hearing impairment.

Main Methods:

Analysis of Human Connectome Project Aging data (n=623).
Utilized T1-weighted MRI and Words in Noise (WIN) thresholds.
Employed Freesurfer for brain structure extraction and linear regression models.

Main Results:

Higher WIN thresholds (poorer hearing) correlated with increased age-related ventricle expansion.
Poorer hearing was associated with reduced cortical thickness in sensory areas and temporal lobe white matter.
Reduced left parahippocampal white matter volume was observed in older adults with poorer hearing and cognitive scores.

Conclusions:

Better hearing is associated with reduced age-related brain structure differences.
Preserving hearing function may mitigate some age-related neurodegenerative changes.
Further longitudinal studies are needed to confirm causality.