Spectral Dynamics and Speech Understanding by Hearing Impaired People
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ClinicalTrials.gov Identifier: NCT01867515 |
Recruitment Status
:
Completed
First Posted
: June 4, 2013
Last Update Posted
: November 22, 2016
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Condition or disease |
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Hearing Loss, Sensorineural |
Study Type : | Observational |
Estimated Enrollment : | 120 participants |
Observational Model: | Case Control |
Time Perspective: | Prospective |
Official Title: | Spectral Dynamics and Speech Understanding by Hearing Impaired People |
Study Start Date : | August 2013 |
Actual Primary Completion Date : | September 2016 |
Actual Study Completion Date : | September 2016 |

Group/Cohort |
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Normally-hearing listeners
Participants with auditory thresholds within the normal limits.
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Hearing-impaired listeners
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
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- Perception of spectral change in speech [ Time Frame: Three years ]The experimental approach compares speech identification performance among normal hearing listeners, hearing-impaired listeners, and normal hearing listeners with simulated hearing impairment. Tasks will be carried out in quiet and in the presence of 2 levels of continuous, speech-shaped background noise. Experimental metrics will be percentage of correct/incorrect speech identification and patterns of response confusions. Error rates and error patterns will be compared among the three listener groups. Performance will also be interpreted relative to the output of a computational model.
- Speech understanding of signals with targeted spectral change enhancement [ Time Frame: Three years ]The experimental approach compares speech identification performance among normal hearing listeners, hearing-impaired listeners, and normal hearing listeners with simulated hearing impairment for stimuli that have been enhanced in the frequency region of the second formant. Tasks will be carried out in quiet and in the presence of two levels of continuous, speech-shaped background noise. Experimental metrics will be percentage of correct/incorrect speech identification and patterns of response confusions.
Biospecimen Retention: None Retained

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Ages Eligible for Study: | 18 Years to 65 Years (Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | Yes |
Sampling Method: | Non-Probability Sample |
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

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01867515
United States, Oregon | |
VA Portland Health Care System, Portland, OR | |
Portland, Oregon, United States, 97239 |
Principal Investigator: | Michelle R Molis, PhD | VA Portland Health Care System, Portland, OR |
Responsible Party: | VA Office of Research and Development |
ClinicalTrials.gov Identifier: | NCT01867515 History of Changes |
Other Study ID Numbers: |
C1020-R 5I01RX001020-03 ( U.S. NIH Grant/Contract ) |
First Posted: | June 4, 2013 Key Record Dates |
Last Update Posted: | November 22, 2016 |
Last Verified: | November 2016 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Undecided |
Keywords provided by VA Office of Research and Development:
Hearing Hearing Loss, sensorineural Speech Perception |
Additional relevant MeSH terms:
Hearing Loss Deafness Hearing Loss, Sensorineural Hearing Disorders Ear Diseases |
Otorhinolaryngologic Diseases Sensation Disorders Neurologic Manifestations Nervous System Diseases Signs and Symptoms |