Cochlear implant Pulse rate Temporal resolution Speech intelligibility
Conditions
Interventions
The patients that comply to the in- and exclusion criteria have specific types of speech processors, each of which is able to carry a maximum of 4 programs (MAPs, which drive the implant electrodes).
Sponsors
Maastricht University Medical Center (MUMC+)
Eligibility
Inclusion criteria
Inclusion criteria: • Mother tongue Dutch • Oral communication as primary mode of communication • Age at inclusion: capacitated adult (≥ 18 years of age) • Onset of severe hearing impairment after the age of 4 (post-lingual) • Minimally 1 year experience with the CI, i.e. at the time of inclusion the first fit should be ≥ 1 years ago (first CI in case of bilateral user) • CI (either unilateral or bilateral) should be from the brand Cochlear
Exclusion criteria
Exclusion criteria: • Non- or impaired Dutch speaker • Sign language or lip reading as primary mode of communication • Incapacitated persons <18 years of age • Onset of severe hearing impairment before the age of 4 (pre-lingual) • Patients that had their first fit < 1 year ago • Patients that use (a) CI(s) other than from the brand Cochlear (bilateral CIs are always of the same brand)
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| There are three main objectives in this research project: 1. Investigate the correlation between varying the CI pulse rate and temporal resolution by means of AMDT at two modulation frequencies 2. Investigate the correlation between varying the CI pulse rate and speech intelligibility by means of standard CVC speech test at normal speech level and LIST 3. Investigate the reproducibility of the measurements, as these are performed in a test-retest fashion. For the listening task in objective 1, the main study parameter is the amplitude modulation detection threshold (AMDT) of postlingual CI users as a function of pulse rate at two modulation frequencies. The AMDT, a measure of temporal resolution, is the minimal modulation depth needed for the subject to distinguish amplitude modulated from amplitude unmodulated noise samples. For objective 2, the main study parameter is speech intelligibility (phoneme score for CVC and SRT for LIST) as a function of pulse rate. For objective 3, the intraclass correlation coefficient and 95% confidence intervals will be determined. | — |
Secondary
| Measure | Time frame |
|---|---|
| As secondary outcomes, correlation coefficients will be calculated between the obtained AMDTs at different modulation frequencies and between AMDTs at different modulation frequencies and speech intelligibility scores for each pulse rate. | — |
Contacts
Public ContactK. Douma
Maastricht University Medical Center
Outcome results
None listed