CC BY-NC-ND 4.0 · Laryngorhinootologie 2018; 97(S 02): S194
DOI: 10.1055/s-0038-1640385
Abstracts
Otologie: Otology

Electrophysiological and Psychophysical Electric-Acoustic Forward Masking in EAS Users

M Imsiecke
1   Medizinische Hochschule Hannover, HNO Klinik, Hannover
,
B Krüger
1   Medizinische Hochschule Hannover, HNO Klinik, Hannover
,
A Büchner
1   Medizinische Hochschule Hannover, HNO Klinik, Hannover
,
T Lenarz
1   Medizinische Hochschule Hannover, HNO Klinik, Hannover
,
W Nogueira
1   Medizinische Hochschule Hannover, HNO Klinik, Hannover
› Institutsangaben
Diese Arbeit wurde unterstützt durch den DFG Exzellenzcluster EXC 1077/1 „Hearing4all“ und MED-EL Medical Electronics.
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    Cochlear implant (CI) users with ipsilateral residual hearing combine acoustic and electric stimulation in one ear both (EAS). In EAS users, forward masking can be shown for electric probes following acoustic maskers and vice versa. The stage at which interaction between the two modalities takes place is so far unclear. In CI users with residual hearing it is possible to record intracochlear potentials with a high spatial resolution via the implanted electrode array. An investigation of the electrophysiological effects during combined electric-acoustic stimulation in humans might be used to assess peripheral mechanisms of masking. Nine MED-EL Flex electrode users with ipsilateral residual hearing participated in an electric-acoustic forward masking experiment. Psychoacoustic methods were used to measure the changes in thresholds due to the presence of maskers. Neural response telemetry was used to obtain electrically evoked compound action potentials (ECAP) for electric-only and for combined electric-acoustic presentation.

    Behavioral thresholds of probe tones, either electric or acoustic, were significantly elevated in the presence of acoustic or electric maskers, respectively. Electric-on-acoustic forward masking showed more pronounced but shorter masking effects. So far electrophysiological measurements could be obtained from one subject during combined electric-acoustic stimulation. Preliminary analysis of these results shows a change in ECAP amplitude due to additional acoustic stimulation, which might depend on the phase of the additional acoustic stimulation. This indicates that peripheral masking effects might have been observed.


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    No conflict of interest has been declared by the author(s).

    Marina Imsiecke
    MHH – HNO,
    Karl-Wiechert Allee 3, 30625,
    Hannover

    Publikationsverlauf

    Publikationsdatum:
    18. April 2018 (online)

    © 2018. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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