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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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Brain Functional Alterations in Long-term Unilateral Hearing Impairment
Jianping Zhu1, Jiangbo Cui2, Gang Cao3
1Department of Imaging, Heping Hospital affiliated to Changzhi Medical College, Changzhi, PR China.
Academic Radiology
|November 4, 2019
Summary
Long-term unilateral hearing impairment (UHI) causes brain functional changes, particularly in auditory and other sensory networks. The severity of hearing loss correlates with altered brain activity, suggesting asymmetrical brain reorganization.
Area of Science:
- Neuroscience
- Audiology
- Medical Imaging
Background:
- Unilateral hearing impairment (UHI) affects auditory afferent transmission and can lead to cerebral cortex functional changes.
- The relationship between brain functional alterations and UHI severity remains unclear.
Purpose of the Study:
- To investigate resting-state brain functional activity in patients with UHI.
- To explore the correlation between functional changes and the duration/severity of hearing impairment.
Main Methods:
- 33 UHI patients and 32 controls underwent resting-state fMRI.
- Fractional amplitude of low-frequency fluctuation (fALFF) values were calculated.
- Pure tone audiometry assessed hearing impairment; correlations with fALFF were analyzed.
Main Results:
- UHI patients showed altered resting-state activity, with increased fALFF in Heschl's gyrus, superior temporal gyrus, and insula.
- Brain reorganization involved visual, cognitive, and sensorimotor networks, not just auditory.
- Functional changes correlated with hearing impairment severity in specific brain regions.
Conclusions:
- Long-term UHI leads to widespread functional brain alterations and network reorganization.
- Brain reintegration mechanisms are asymmetrical, with lateralization patterns linked to hearing loss severity.
Keywords:
Fractional amplitude of low frequency fluctuationFunctional magnetic resonance imagingHearing lossUnilateral hearing impairmentMore Related Videos
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