Evaluation of Speech Intelligibility in Noise in Bilateral Cochlear Implant Users under Realistic Sound Environments

* Presenting author
Day / Time: 22.03.2018, 10:20-10:40
Room: Interim 2
Typ: Vortrag (strukturierte Sitzung)
Abstract: This work investigates the benefit of bilateral cochlear implantation in terms of speech intelligibility in realistic noise environments.Speech reception thresholds (SRTs) were measured in 10 bilateral cochlear implant (CI) subjects and 10 normal hearing (NH) listeners using the Oldenburg sentence test. SRTs were assessed in different conditions: binaural summation (BS), spatial release from masking symmetric (SRM-S) and asymmetric (SRM-A) and squelch (SQ). Finally, SRTs were measured in two realistic sound environments rendering a cafeteria noise with the TASCAR library using third-order Ambisonics decoded to a 16 loudspeakers. Each condition was measured for unilateral and bilateral CI use or in NH listeners using one or both ears.Bilateral CI users obtained an SRT benefit using the second implant only in the SRM-A condition. NH listeners however obtained SRT benefits when using both ears in the SRM-A, SRM-S and SQ conditions. The overall speech intelligibility improvements in the realistic environment show modest improvement in bilateral CI users and demonstrate a clear benefit in NH listeners. These results demonstrate the limitations of binaural hearing with CIs and the good correspondence between the lab settings and the realistic environments. This work received funding from the DFG Cluster of Excellence EXC 1077/1 Hearing4all