Spectral Dynamics and Speech Understanding by Hearing Impaired People
| Status: | Completed |
|---|---|
| Conditions: | Other Indications, Other Indications, Other Indications |
| Therapuetic Areas: | Other |
| Healthy: | No |
| Age Range: | 18 - 65 |
| Updated: | 4/28/2018 |
| Start Date: | August 2013 |
| End Date: | September 2016 |
The purpose of this program of research is to understand the perception of the dynamic
spectral properties of speech by hearing-impaired listeners, with the long-term goal of
improving speech understanding by these individuals in adverse listening conditions. The
proposed research compares the performance of normally-hearing and hearing-impaired listeners
on measures of speech understanding in the presence of different types of signal distortion
and speech understanding of signals with enhanced spectral dynamics. A computational model
based on the amount of potential information available in speech will be used to quantify
differences in speech intelligibility due to hearing status and stimulus characteristics.
spectral properties of speech by hearing-impaired listeners, with the long-term goal of
improving speech understanding by these individuals in adverse listening conditions. The
proposed research compares the performance of normally-hearing and hearing-impaired listeners
on measures of speech understanding in the presence of different types of signal distortion
and speech understanding of signals with enhanced spectral dynamics. A computational model
based on the amount of potential information available in speech will be used to quantify
differences in speech intelligibility due to hearing status and stimulus characteristics.
This is a behavioral study of human auditory perception. Each experiment in this study
involves prospective data collection from three types of listeners. The experimental
listeners will be people with sensorineural hearing loss and the control listeners will
either be subjects with normal hearing or normal-hearing listeners for whom hearing loss will
be simulated through the use of a spectrally-shaped broadband noise. The tasks of the
subjects in this study involve either listening to synthesized sounds over earphones while
seated comfortably in a sound-treated booth, and making responses indicating the subject's
auditory perception of these sounds by touching specific areas on a touch-screen terminal;
or, listening to recorded, acoustically modified syllables, words, or sentences over
earphones and making responses indicating the subject's identification.
involves prospective data collection from three types of listeners. The experimental
listeners will be people with sensorineural hearing loss and the control listeners will
either be subjects with normal hearing or normal-hearing listeners for whom hearing loss will
be simulated through the use of a spectrally-shaped broadband noise. The tasks of the
subjects in this study involve either listening to synthesized sounds over earphones while
seated comfortably in a sound-treated booth, and making responses indicating the subject's
auditory perception of these sounds by touching specific areas on a touch-screen terminal;
or, listening to recorded, acoustically modified syllables, words, or sentences over
earphones and making responses indicating the subject's identification.
Inclusion Criteria:
- individuals with hearing thresholds of 20 dB HL or better at all octave frequencies
between 250 Hz and 4000 Hz
- or, individuals with bilateral sensorineural hearing losses with thresholds between 25
and 70 dB HL and no losses greater than 70 dB HL at frequencies of 4000 Hz or below
Exclusion Criteria:
- a conductive hearing impairment or other otological pathology
- hearing thresholds greater than 70 dB HL at any frequencies of 4000 Hz or below or
pure-tone averages (averaged across 500, 1000, and 2000 Hz) of greater than 65 dB HL
- bilateral differences greater than 20 dB at any frequency below 4000 Hz
- an inability to complete the experimental tasks
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