Interaural Frequency and Loudness Mismatch in SSD CI Users
NCT ID: NCT05494632
Last Updated: 2025-12-26
Study Results
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View full resultsBasic Information
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COMPLETED
NA
45 participants
INTERVENTIONAL
2022-08-12
2025-08-01
Brief Summary
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Detailed Description
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Binaural processing is also affected when signals of equal frequency are not matched in pitch at each ear. In bilateral CI recipients, the investigators found that the greater the pitch mismatch between ears, the poorer the speech understanding in noise. The investigators want to extend this work to SSD-CI recipients. Through CI program modifications, the study aims to decrease the pitch and loudness mismatch between the CI ear and the normal hearing ear to improve binaural listening abilities, specifically speech understanding in noise and sound localization.
Conditions
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Study Design
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NON_RANDOMIZED
SINGLE_GROUP
TREATMENT
NONE
Study Groups
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Period 1: Study 1
CI speech processor programming in experienced cochlear implant (CI) recipients with single sided deafness. Program changes were made to decrease the interaural frequency mismatch between the CI ear and the contralateral ear.
Treatment-modifications to CI speech processor program. Specifically reducing interaural frequency mismatch in experienced SSD-CI recipients.
We will modify the CI speech processor program to reduce interaural frequency mismatch between the CI ear and the contralateral ear in experienced CI recipients with SSD.
Period 2: Study 2
CI speech processor programming in newly implanted cochlear implant (CI) recipients with single sided deafness. Program changes were made to decrease the interaural frequency mismatch between the CI ear and the contralateral ear.
Treatment-modifications to CI speech processor program to reduced interaural frequency mismatch in newly implanted SSD-CI recipients.
We will modify the CI speech processor program to reduce interaural frequency mismatch between the CI ear and the contralateral ear in newly implanted CI recipients with SSD.
Period 3: study 3
CI speech processor programming in experienced cochlear implant (CI) recipients with single sided deafness. Program changes were made to decrease the interaural loudness mismatch between the CI ear and the contralateral ear.
Treatment-modifications to CI speech processor program to reduced interaural loudness mismatch in experienced SSD-CI recipients.
We will modify the CI speech processor program to reduce interaural loudness mismatch between the CI ear and the contralateral ear in experienced CI recipients with SSD.
Interventions
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Treatment-modifications to CI speech processor program. Specifically reducing interaural frequency mismatch in experienced SSD-CI recipients.
We will modify the CI speech processor program to reduce interaural frequency mismatch between the CI ear and the contralateral ear in experienced CI recipients with SSD.
Treatment-modifications to CI speech processor program to reduced interaural frequency mismatch in newly implanted SSD-CI recipients.
We will modify the CI speech processor program to reduce interaural frequency mismatch between the CI ear and the contralateral ear in newly implanted CI recipients with SSD.
Treatment-modifications to CI speech processor program to reduced interaural loudness mismatch in experienced SSD-CI recipients.
We will modify the CI speech processor program to reduce interaural loudness mismatch between the CI ear and the contralateral ear in experienced CI recipients with SSD.
Eligibility Criteria
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Inclusion Criteria
* 18 years of age and older
* Postlingual onset of SSD
* Pure tone average (PTA) at 500, 1000, and 2000 Hz of less than or equal to 30 dB HL in the contralateral ear, known as the normal hearing ear
* Implanted with or chosen to be implanted with a Nucleus cochlear implant
* Full insertion of electrode array
18 Years
ALL
No
Sponsors
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Cochlear
INDUSTRY
Washington University School of Medicine
OTHER
Responsible Party
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Jill B Firszt, PhD
Professor
Principal Investigators
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Jill B Firszt, PhD
Role: PRINCIPAL_INVESTIGATOR
Washington University School of Medicine
Locations
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Washington University School of Medicine
St Louis, Missouri, United States
Countries
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Provided Documents
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Document Type: Study Protocol and Statistical Analysis Plan
Other Identifiers
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202206085
Identifier Type: -
Identifier Source: org_study_id