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The association between hearing impairment and neural envelope encoding at different ages
Tine Goossens1, Charlotte Vercammen1, Jan Wouters1
1KU Leuven - University of Leuven, Department of Neurosciences, Research Group Experimental ORL (ExpORL), Leuven, Belgium.
Neurobiology of Aging
|November 26, 2018
Summary
Hearing impairment alters how the brain processes speech envelope modulations. Young and middle-aged adults with hearing loss show heightened neural synchronization, while older adults exhibit hemispheric asymmetry.
Area of Science:
- Auditory Neuroscience
- Speech Processing
- Neuroscience of Hearing
Background:
- Hearing impairment causes speech perception difficulties due to poor hearing sensitivity and altered central auditory processing.
- Temporal processing of the speech envelope, via neural synchronization to envelope modulations, is crucial for speech perception.
- Existing theories suggest hearing impairment may lead to enhanced sensitivity to envelope modulations, correlating with poorer speech perception.
Purpose of the Study:
- To investigate age-related changes in neural envelope encoding in hearing-impaired (HI) versus normal-hearing (NH) individuals.
- To test the hypothesis that HI listeners exhibit altered neural synchronization to speech envelope modulations.
- To determine if these alterations are influenced by age and audibility correction.
Main Methods:
- Comparative electrophysiological study design.
- Inclusion of three age groups: young, middle-aged, and older adults.
- Measurement of neural envelope encoding and synchronization to envelope modulations in HI and NH listeners.
Main Results:
- Young and middle-aged HI adults demonstrated enhanced neural synchronization to envelope modulations compared to NH controls, even after audibility correction.
- In older adults, neural synchronization levels were comparable between HI and NH groups.
- Older HI individuals displayed a synchronization asymmetry favoring the right hemisphere.
Conclusions:
- Hearing impairment significantly alters the neural encoding of speech envelope modulations.
- The nature of these neural encoding changes is age-dependent.
- Age-related differences in neural processing, including hemispheric specialization, are evident in individuals with hearing impairment.
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