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Updated: Jun 24, 2025
06:04
Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
377
Frequency importance functions in simulated bimodal cochlear-implant users with spectral holes
Yang-Soo Yoon1, Reagan Whitaker2, Naomi White1
1Department of Communication Sciences and Disorders, Baylor University, Waco, Texas 76798, USA.
The Journal of the Acoustical Society of America
|June 3, 2024
Summary
Frequency importance functions (FIFs) reveal how different frequency bands contribute to speech understanding in simulated bimodal hearing. Higher frequency channels (5 and 6) are most important, especially in noise.
Area of Science:
- Audiology
- Speech Science
- Neuroscience
Background:
- Bimodal hearing combines acoustic and electric hearing.
- Understanding frequency contributions is crucial for cochlear implant users.
Purpose of the Study:
- To derive frequency importance functions (FIFs) for simulated bimodal hearing.
- To investigate the impact of frequency map overlap and noise on speech perception.
Main Methods:
- Simulated acoustic hearing using low-pass filtering.
- Simulated electric hearing with a six-channel vocoder and varying frequency maps (overlap, meet, gap).
- Speech perception in quiet and noise was measured to derive FIFs.
Main Results:
- FIFs differed significantly across frequency maps.
- Channels 5 and 6 consistently showed the highest importance for speech perception.
- Channels 1 and 2 consistently showed the lowest importance.
- The contribution of frequency bands varied with the degree of acoustic-electric frequency overlap and the presence of noise.
Conclusions:
- Cochlear implant frequency band contribution to bimodal speech perception is influenced by acoustic-electric overlap.
- Noise significantly impacts the weighting of frequency bands for speech perception.
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