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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

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Sensitivity to interaural envelope correlation changes in bilateral cochlear-implant users.

Matthew J Goupell¹, Ruth Y Litovsky²

¹Department of Hearing and Speech Sciences, University of Maryland, College Park, Maryland 20742.

The Journal of the Acoustical Society of America

|January 26, 2015

Summary

This summary is machine-generated.

Bilateral cochlear implants (CIs) offer limited speech understanding benefits due to poor binaural unmasking. Cochlear implant users showed difficulty perceiving changes in interaural envelope correlation, hindering speech-in-noise performance.

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Area of Science:

Audiology
Neuroscience
Biomedical Engineering

Background:

Bilateral cochlear implants (CIs) aim to improve speech understanding in noise.
However, current bilateral CI users exhibit minimal binaural unmasking benefits, primarily relying on monaural head shadow effects.

Purpose of the Study:

To investigate the sensitivity to changes in interaural envelope correlation in bilateral CI users.
This sensitivity is crucial for understanding binaural speech unmasking.

Main Methods:

Bilateral CI users were tested with synchronized processors on pitch-matched electrode pairs.
Binaural masking level differences (BMLDs) were measured using 1000 pulse-per-second (pps) carriers.
Envelope correlation change just-noticeable differences (JNDs) were assessed at different pulse rates and reference correlations.

Main Results:

BMLDs were measured at 11.1 ± 6.5 dB (10-Hz bandwidth) and 8.5 ± 4.2 dB (50-Hz bandwidth).
Lower JNDs for envelope correlation changes were observed with 1000 pps compared to 100 pps stimuli.
Approximately 25% of CI users' JNDs fell within the range of normal-hearing listeners using CI simulations.

Conclusions:

Bilateral CI users can detect changes in interaural envelope correlation.
Impaired sensitivity to these changes may significantly limit binaural unmasking effectiveness in real-world listening conditions.