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The Effect of Peripheral Compression on Syllable Perception Measured with a Hearing Impairment Simulator
Toshie Matsui1, Toshio Irino2, Misaki Nagae2
1Faculty of Systems Engineering, Wakayama University, Sakaedani 930, 640-8510, Wakayama-city, Japan. tmatsui@sys.wakayama-u.ac.jp.
Advances in Experimental Medicine and Biology
|April 16, 2016
Summary
A hearing impaired (HI) simulator revealed that reduced cochlear compression significantly impacts syllable recognition, especially when speech elements are quieter. This highlights compression loss as a key factor in speech perception difficulties for hearing impaired individuals.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Hearing Impairment Research
Background:
- Hearing impaired (HI) individuals struggle with speech comprehension in complex auditory environments.
- Pinpointing specific auditory processing deficits in HI listeners is challenging.
- Age-related cognitive decline can exacerbate hearing-related speech perception issues.
Purpose of the Study:
- To quantify the impact of reduced cochlear compression on syllable recognition using a dynamic, compressive gammachirp (dcGC) filterbank HI simulator.
- To isolate the effects of compression loss on speech perception by counteracting cochlear compression in normal hearing (NH) listeners.
- To simulate hearing loss comparable to an average 80-year-old with varying degrees of compression loss.
Main Methods:
- Utilized a dcGC filterbank-based HI simulator to model cochlear compression loss.
- Measured syllable recognition by having NH listeners identify the second syllable in a three-syllable nonsense word.
- Varied the relative level of the second syllable or the entire sequence between trials to determine Speech Reception Threshold (SRT).
Main Results:
- The loss of cochlear compression significantly impaired syllable recognition, particularly when the target syllable was attenuated.
- The HI simulator effectively isolated the deficit associated with reduced compression in speech perception.
- The greatest impact on recognition occurred when the second syllable's internal representation was disproportionately reduced due to compression loss.
Conclusions:
- Reduced cochlear compression is a critical factor contributing to speech perception difficulties in hearing impaired individuals.
- The dcGC filterbank simulator provides a valuable tool for investigating the specific effects of cochlear processing deficits.
- Understanding the role of compression loss can inform strategies for improving speech understanding in noisy environments for HI listeners.
Keywords:
AudiogramCochlear compressionDynamic compressive gammachirp filterbankHearing impairment simulatorMore Related Videos
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