Improving Cochlear Implant Outcomes Through Modeling and Programming Strategies Based on Human Inner Ear Pathology
Cochlear implants are devices placed in the inner ear through surgery to help people with severe to profound hearing loss. While these devices work well overall, results vary widely from person to person. Many people with cochlear implants still have trouble understanding speech in noisy places and enjoying music.
This study looks at whether customizing the way a cochlear implant is programmed, based on the health of the hearing nerve in different areas of the ear, can help people understand speech better in noisy settings. The researchers will adjust or turn off certain electrodes in areas where the nerve appears weaker, then test whether this improves hearing compared to each person's everyday program. They will also examine whether giving people time to get used to the new program leads to better results.
Panoramica dello studio
Stato
Condizioni
Descrizione dettagliata
Cochlear implants are surgically placed in the inner ears of people with severe to profound hearing loss. Although these devices are generally successful, outcomes differ a great deal from one person to the next. Many people who use cochlear implants continue to struggle with understanding speech when there is background noise and with appreciating music. More research is needed to understand why results vary so much among cochlear implant users.
The main goal of this study is to better understand the underlying condition of the inner ear and how it relates to how well people hear with their cochlear implant. The researchers will use this knowledge to test new ways of programming the devices. A cochlear implant has multiple electrodes, and each one stimulates a different region of the hearing nerve. In some people, certain regions of the nerve are healthier than others. By estimating where the nerve is weaker or stronger, the researchers hope to program the device in a way that takes advantage of the healthier areas.
The study has one main aim with two parts:
The first part compares how well participants understand speech in noise using their usual everyday program versus an experimental program. In the experimental program, the electrical signal is narrowed and focused for electrodes that are farther from healthy nerve regions, and electrodes near poorly functioning nerve regions may be turned off. These adjustments are guided by a model of nerve health developed in earlier research.
The second part looks at whether performance improves after participants spend four weeks getting used to the experimental program. The researchers expect that programming based on each person's individual nerve health will improve their ability to understand speech in noise, and that this improvement will be greater after they have had time to adjust to the new program.
This work is expected to provide a better understanding of how long a person needs to adapt when their programming strategy changes. The findings could be applied fairly quickly in clinical settings to improve speech understanding for both adults and children who use cochlear implants.
Tipo di studio
Iscrizione (Stimato)
Fase
- Non applicabile
Contatti e Sedi
Contatto studio
- Nome: Julie Arenberg, PhD, CCC-A
- Numero di telefono: 617-807-7904
- Email: julie_arenberg@meei.harvard.edu
Criteri di partecipazione
Criteri di ammissibilità
Età idonea allo studio
- Adulto
- Adulto più anziano
Accetta volontari sani
Descrizione
Inclusion Criteria:
- Age 18 - 80 years old
- Native speakers of American English or Multilingual
- Wears a cochlear implant manufactured by Advanced Bionics (Clarion Hi-Focus I or newer)
- At least 6 months of listening experience with their cochlear implant, but could be recruited and consented prior.
- Bilateral hearing loss
Exclusion Criteria:
- Inability to provide informed consent
- Lost their hearing prior to the age of language acquisition (3-4 years) but did not receive a cochlear implant until adulthood
- Do not have age-appropriate speech perception testing from clinical visits or do not use their implant for oral communication
- Have neurological disease
- Have unmanageable facial nerve stimulation or pain as a result of their implant
- Does not tolerate implant well
- Unable to carry out the study protocol or tasks required in the study
- Poor vision such that the subject cannot adequately perform the study tasks on the computer screen
Piano di studio
Come è strutturato lo studio?
Dettagli di progettazione
- Scopo principale: Altro
- Assegnazione: N / A
- Modello interventistico: Assegnazione di gruppo singolo
- Mascheramento: Nessuno (etichetta aperta)
Armi e interventi
Gruppo di partecipanti / Arm |
Intervento / Trattamento |
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Sperimentale: All Participants (Within-Subjects Crossover)
This is a within-subjects study in which all enrolled participants receive every condition. Each participant's everyday clinical listening program serves as the control and is compared against two experimental sound-processing strategies based on electrode-neuron interface (ENI) estimates. In the in-lab phase (Sub-Aim 1.1), all programs are compared acutely. In the take-home phase (Sub-Aim 1.2), participants complete a 12-week crossover consisting of 4 weeks with their clinical program followed by 4 weeks with each experimental strategy, with the order of programs randomized. |
The participant's standard clinical cochlear implant sound-processing program, as currently fit for everyday use.
This serves as the within-subjects control condition and remains available as a backup throughout the take-home trial.
An experimental cochlear implant sound-processing strategy that applies focused electrical fields for electrodes distant from regions of healthy neural tissue and/or deactivates channels near regions of poor neural density or integrity, as inferred from a previously developed electrode-neuron interface model.
Tested acutely in the lab and during one 4-week take-home interval.
A second experimental cochlear implant sound-processing strategy applying focused electrical fields and/or channel deactivation based on electrode-neuron interface estimates, configured differently from Experimental Program 1. Tested acutely in the lab and during one 4-week take-home interval.
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Cosa sta misurando lo studio?
Misure di risultato primarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
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Change in Sentence Recognition in Noise (Everyday Program vs. Experimental Programs), In-Lab
Lasso di tempo: Across a minimum of two in-lab sessions (each up to 3.5 hours)
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Sentence recognition in background noise will be measured using the American Matrix Test (AMT), an adaptive, closed-set speech-in-noise test consisting of 4 blocks of 20 sentences each (5 words per sentence).
The adaptive procedure yields a speech reception threshold expressed in dB SNR, the signal-to-noise ratio at which the participant correctly identifies 50 percent of words, with lower (more negative) values indicating better performance.
Scores obtained with the participant's everyday clinical listening program (control) will be compared to scores obtained with two experimental sound-processing strategies that apply focused electrical fields for distant electrodes and/or deactivate channels near regions of poor neural density or integrity, as inferred from a previously developed electrode-neuron interface model.
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Across a minimum of two in-lab sessions (each up to 3.5 hours)
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Change in Vowel Identification (Everyday Program vs. Experimental Programs), In-Lab
Lasso di tempo: Across a minimum of two in-lab sessions (each up to 3.5 hours)
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Medial vowel identification will be measured using a closed-set vowel discrimination task in quiet and at a +10 dB signal-to-noise ratio in four-talker babble noise.
Performance is scored as percent correct, with higher values indicating better performance.
Scores obtained with the participant's everyday clinical program (control) will be compared to scores obtained with the two experimental sound-processing strategies.
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Across a minimum of two in-lab sessions (each up to 3.5 hours)
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Misure di risultato secondarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
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Change in Sentence Recognition in Noise After 4 Weeks of Acclimatization (Crossover)
Lasso di tempo: Baseline and after 4 weeks of take-home use for each program, within a 12-week crossover trial
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Using a randomized crossover design, sentence recognition in noise (American Matrix Test) will be assessed before and after 4 weeks of at-home listening for the control program and each experimental program.
The adaptive procedure yields a speech reception threshold in dB SNR, with lower (more negative) values indicating better performance.
Participants complete 4 weeks of baseline testing with their clinical program followed by 4 weeks with each of the two experimental strategies.
The outcome is the change in score across time points and programs, evaluating the effect of acclimatization.
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Baseline and after 4 weeks of take-home use for each program, within a 12-week crossover trial
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Change in Vowel Identification After 4 Weeks of Acclimatization (Crossover)
Lasso di tempo: Baseline and after 4 weeks of take-home use for each program, within a 12-week crossover trial
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Using the randomized crossover design, medial vowel identification will be assessed before and after 4 weeks of at-home listening for the control and experimental programs.
Performance is scored as percent correct, with higher values indicating better performance.
The outcome evaluates the effect of acclimatization on performance.
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Baseline and after 4 weeks of take-home use for each program, within a 12-week crossover trial
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Altre misure di risultato
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
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Subjective Sound Quality Ratings
Lasso di tempo: Baseline and weekly during the 12-week take-home trial
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Participants rate the sound quality of the listening programs using a custom Sound Quality Questionnaire administered at baseline and at weekly intervals throughout the take-home trial.
Results are reported as scores on the questionnaire's rating scale.
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Baseline and weekly during the 12-week take-home trial
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Electrically Evoked Compound Action Potential (ECAP)
Lasso di tempo: Collected during in-lab sessions (each up to 3.5 hours)
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The Electrically Evoked Compound Action Potential (ECAP) will be recorded via telemetry to measure the auditory nerve's response to electrical stimulation delivered through the cochlear implant.
Response amplitude is reported in microvolts.
This measure helps characterize the electrode-neuron interface used to inform the experimental programming strategies.
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Collected during in-lab sessions (each up to 3.5 hours)
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Electrical Field Imaging (EFI)
Lasso di tempo: Collected during in-lab sessions (each up to 3.5 hours)
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Electrical Field Imaging (EFI) will be recorded via telemetry to measure the distribution of electrical current within the cochlea where the implant electrodes are located.
Recorded voltages are reported in volts.
This measure helps characterize the electrode-neuron interface used to inform the experimental programming strategies.
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Collected during in-lab sessions (each up to 3.5 hours)
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Psychophysical Detection Threshold
Lasso di tempo: Collected during in-lab sessions (each up to 3.5 hours)
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Detection threshold, defined as the softest level at which the participant can detect a stimulus, will be measured across multiple electrode configurations including monopolar and novel focused stimulation modes.
Thresholds are reported in clinical units (CU) as used for clinical device programming.
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Collected during in-lab sessions (each up to 3.5 hours)
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Maximum Comfortable Level (MCL)
Lasso di tempo: Collected during in-lab sessions (each up to 3.5 hours)
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Maximum comfortable level, defined as the level that is loud but still comfortable, will be measured across multiple electrode configurations including monopolar and novel focused stimulation modes.
Levels are reported in clinical units (CU) as used for clinical device programming.
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Collected during in-lab sessions (each up to 3.5 hours)
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Collaboratori e investigatori
Investigatori
- Investigatore principale: Julie Arenberg, PhD, CCC-A, Massachusetts Eye and Ear
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Altri numeri di identificazione dello studio
- 2026P001659
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