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Using Alpha-Band Power to Evaluate Hearing Aid Directionality Based on Multistream Architecture.
Christopher Slugocki1, Francis Kuk1, Petri Korhonen1
1Office of Research in Clinical Amplification (ORCA-USA), WS Audiology, Lisle, IL.
American Journal of Audiology
|September 20, 2024
Summary
New hearing aid technology using multistream architecture (MSA) reduces brain activity linked to listening effort in noisy environments. This technology may help evaluate hearing aid effectiveness in challenging situations.
Area of Science:
- Neuroscience
- Audiology
- Hearing Science
Background:
- Hearing aid directivity aims to improve speech-in-noise (SiN) perception.
- Multistream architecture (MSA) is a hearing aid technology designed to enhance directional hearing.
- Alpha-band neural activity is often associated with cognitive load and task difficulty.
Purpose of the Study:
- To investigate if hearing aid directivity via MSA reduces alpha-band electroencephalographic (EEG) activity, indicating reduced listening effort.
- To correlate behavioral SiN benefits with neural activity changes.
Main Methods:
- A within-subject, single-blind study with 13 older adults with hearing loss.
- Participants performed a SiN test with hearing aids in MSA-ON and MSA-OFF conditions.
- EEG was recorded to measure alpha-band oscillations during the SiN tasks.
Main Results:
- Alpha-band activity was significantly reduced over centroparietal sites in the MSA-ON condition compared to MSA-OFF.
- Alpha-band power increased over trials, suggesting potential listener fatigue.
- Reductions in alpha-band power did not significantly correlate with behavioral SiN improvements.
Conclusions:
- MSA hearing aid directivity lowers neural activity associated with listening difficulty in simulated multitalker scenarios.
- Alpha-band EEG may serve as a valuable tool for assessing the impact of hearing aid processing on listening effort.
- Further research is needed to understand the relationship between neural changes and individual behavioral benefits.
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