Channel Interaction in Cochlear Implant and Speech Understanding in Noise

Summary

The goal of this study is to take into account channel interaction in the cochlear implant (CI) fitting process. Designing a fast and accurate method of measurement would help to customize the fitting procedures to patients' specificities in order to maximize speech understanding in every day conditions especially in noise.

Conditions

• Cochlear Implants

Interventions

OTHER

speech audiometry in noise

Subjects will be asked to repeat lists of words played by speakers in a noisy environment generated by the same speakers. A percentage of correct recognition is calculated for each list.

OTHER

Psychophysical tuning curves in forward masking

Sounds of variable center frequency are used as maskers, and a tone with a fixed frequency at a fixed level is the target. What is tested here is the level of masker that just masks the target.

OTHER

Electrically-evoked Auditory Brainstem Response (EABR)

Channel interaction assessment using eABRs (auditory nerve responses). The method consists of two measurements: 1) eABR measurements with stimulation by a single electrode of the cochlear implant at 70% of the dynamic range (four different electrodes are tested); 2) Measurement of a single eABR with stimulation from all four electrodes at 70% of the dynamic range. A comparison of the eABRs obtained by these two measurements, indicates the electrical and neural interactions between the electrodes.

OTHER

Tonal audiometry

Tonal audiometry will be performed with headphones

OTHER

Auditory canal examination

Otoscopic examination of external auditory canal and eardrum

Sponsors & Collaborators

• Hospices Civils de Lyon

  lead OTHER

Principal Investigators

• Eric TRUY, MD, PhD · Hospices Civils de Lyon

Study Design

Allocation

NON_RANDOMIZED

Purpose

BASIC_SCIENCE

Masking

NONE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

60 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2019-02-24

Primary Completion

2021-02-18

Completion

2021-02-18

Countries

• France

Study Locations