Improved Speech Recognition Performance in Noise by Encoding Binaural Spatial Cues to the Cochlear Implant User.

Oticon Medical

Overview

The aim of the study is to evaluate the interaural time difference (ITD) benefit in patients with bilateral cochlear implants and to assess speech performance in noisy conditions compared to normal hearing listeners. Half of participants are bilateral cochlear implants users, while the other are normal hearing listeners.

Listening in noisy environments is part of everyday life, it is based on binaural phenomena such as spatial localization.

Study Type

INTERVENTIONAL

Allocation

NON_RANDOMIZED

Purpose

BASIC_SCIENCE

Masking

NONE

Conditions

Hearing Loss, Cochlear

Interventions

S0N0OTHER

(no ITD)

S0N500OTHER

(ITD +500µs on noise)

S-500N500OTHER

(ITD -500µs on signal and +500 µs on noise)

S0N1000

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Fluent in local language * Normal hearing listener: * pure tone threshold \> 25dB from 125Hz to 12kHz * Cochlear implant recipient * bilaterally implanted 6 months at least, the second implant should be implanted 6 months at least before participant inclusion * Digisonic SP® cochlear implants user Exclusion Criteria: * binaural sensitivity threshold \< 1000µs

Outcomes

Primary Outcomes

speech reception threshold (SRT) in bilateral cochlear implant user with ITD cue

SRT is used as an outcome measure to quantify the acuity for speech perception in noise with Interaural Time Difference between the two ears. Signal recognition in a background noise is assessed the following conditions S0N0, S0N500, S0N1000, S-500N500 et S0Nuncorr. The noise level is constant at 65 dB SPL, the signal level is modified in the adaptive procedure in order to converge towards a score of 50% of correct response.

Time frame: day 0

Secondary Outcomes

speech reception threshold (SRT) in bilateral cochlear implant user without ITD cue and in normal hearing listeners

SRT is used as an outcome measure to quantify the acuity for speech perception in noise without Interaural Time Difference between the two ears.

Time frame: day 0

ITD sensitivity in bilateral cochlear implant user

Speech signal and noise are presented at 65dB SPL. Participant adjusts the Interaural Time Difference between the speech signal and noise between -1000 and +1000µs. Participant moves the cursor on the interface until he/she hears a difference in sound.

Time frame: day 0

Preferred jitter in bilateral cochlear implant user

Speech signal and noise are presented at 65dB SPL. Participant adjusts the jitter of the train pulse timing from 0 to +1000µs to improve the Interaural Time Difference.

Time frame: day 0

Data from ClinicalTrials.gov

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