Deafness
Conditions
Brief summary
The purpose of this study is to understand performance with a cochlear implant. The long-term goals of this research are to improve sound perception with cochlear implants and to better understand the functioning of the auditory system. Information from individuals with and without cochlear implants will be compared.
Detailed description
The overall objectives of this research are to 1) gain a better understanding of fundamental psychophysical abilities with electrical stimulation as a function of age (child vs adult), age at onset of deafness (pre- vs post-lingual), and acoustic hearing (normal vs limited or residual); and 2) determine whether manipulations in CI coding strategies will improve psychophysical and speech recognition outcomes for early implanted children. This work is expected to provide new insights into the corresponding improvements in perceptual outcomes to these newer strategies have been modest at best and performance has begun to level off.
Interventions
OTHERSingle-Electrode Pulse Train
AIM 2 - Stimuli will be presented on one of three electrodes (apical, middle, and basal) at an amplitude between 10 and 100% dynamic range in µAs in 10% dynamic range steps. Stimulation will be delivered at a rate of 1000 pps. The process will be repeated in random order until 20 loudness estimates are obtained for each stimulus (3 electrodes x 2 rates x 10 amplitudes) for each subject. The dynamic range will be determined by measuring the maximum acceptable loudness (MAL) and threshold for each of the stimuli. MAL will be measured by slowly raising the current level for each stimulus until the subject reports that it is as loud as they are willing to accept without becoming uncomfortably loud.
OTHERModulation Detection Threshold (MDT) and Gap Detection Tasks
AIM 1 - MDT will be set at 150 Hz. Testing will be conducted in soundfield in a sound booth at 60 dB Sound Pressure Level (SPL) while the participant listens with both implants adjusted to user setting.
OTHERSound coding strategy.
Aim3 - Spectral-temporally modulated ripple test (SMRT), Quick Spectral Modulation Detection (QSMD), Modulation Detection, Gap Detection. CNC words will be set in quiet and Az-Bio/BabyBio sentences in quiet and multi-talker babble (+10 and +5 dB SNR) using both the subject's clinical map and the new reduced channels map. Tests will be presented in the soundfield at 60 dB SPL
OTHERElectric-only spectral resolution
Aim 1- Spectral resolution will be tested using frequency allocations consisting of the full default clinical range as well as the subject's clinical frequency allocation if they differ. For Hybrid electrode users in which electrode contacts are closer in proximity in the cochlea, maps with a frequency allocation of 938-7938 Hz will also be tested in that it will closely approximate the frequency spacing of a Nucleus Contour Advance electrode array. Spectral resolution will be measured with three repetitions of the SMRT and one repetition of the QSMD test. Testing will be presented at 60 dB SPL in the soundfield with the acoustic ear plugged and muffed.
Sponsors
NYU Langone Health
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
ALL
Age
6 Years to 80 Years
Healthy volunteers
Yes
Inclusion criteria
* Be 7 years of age or older and pre-lingually implanted with a cochlear implant (before the age of 2 years), have aided residual hearing, or have normal hearing. * Be ages 18 or older and post-lingually implanted or have normal hearing. * Be ages 18-35 and pre-lingually implanted.
Exclusion criteria
* Any child implanted post-lingually
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in loudness growth in Cochlear Implant participants | Baseline Visit (Day 1) , Visit week 10 | Power functions will be fit for each of the loudness growth curves. Data will be analyzed using a mixed-design ANOVA with the two groups as the between-subjects factor and electrode and rate as within-subject factors. |
| Change in temporal resolution in Cochlear implant participants | Baseline Visit (Day 1) , Visit week 10 | A mixed-effect ANOVA will be conducted to determine if there is an effect of age group (children vs adults) and hearing condition (CI vs NH) for both modulation detection and gap detection tasks. Post-hoc two-sample t-tests will compare differences between NH and CI children as well as NH and CI adults. Post-hoc paired t-tests will compare differences between adults and children for both the NH and the CI populations. |
| Change in spectral resolution in Cochlear implant participants | Baseline Visit (Day 1) , Visit week 10 | A one-way ANOVA will be used to calculate the differences between the four groups. If significant, post-hoc t-tests will be performed using Rom's modified Bonferroni Type I error correction. |
| Difference in performance between the reduced channel map and the full map | Baseline Visit (Day 1) , Visit week 10 | A mixed-design ANOVA will be conducted for each of the tests with subject population as the between-subjects factor and sound coding strategy as the within-subjects factor |
Countries
United States
Contacts
CONTACTDavid M Landsberger, MD
CONTACTNatalia Stupak
PRINCIPAL_INVESTIGATORDavid M Landsberger, MD
NYU Langone Health
Outcome results
None listed