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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

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Published on: March 24, 2023

Speech-perception-in-noise and bilateral spatial abilities in adults with delayed sequential cochlear implant.

Ilze Oosthuizen¹, De Wet Swanepoel, Catherine van Dijk

¹Department of Communication Pathology, University of Pretoria.

The South African Journal of Communication Disorders = Die Suid-Afrikaanse Tydskrif Vir Kommunikasieafwykings

|February 16, 2013

Summary

Adults with delayed sequential cochlear implants showed minimal bilateral benefit for speech-in-noise perception. The head-shadow effect was the most significant bilateral spatial benefit, with later implants contributing more to overall improvement.

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Area of Science:

Audiology
Neuroscience
Biomedical Engineering

Background:

Bilateral cochlear implantation (CI) aims to improve speech perception in noise.
Delayed sequential implantation involves receiving the second CI after a significant delay.
Understanding bilateral benefits is crucial for optimizing hearing outcomes.

Purpose of the Study:

To assess speech-in-noise perception in adults with delayed sequential CIs.
To quantify bilateral spatial benefits, including head-shadow effect, summation, squelch, and spatial release from masking.
To compare these benefits with findings from simultaneous or earlier sequential CI recipients.

Main Methods:

Cross-sectional, one-group, post-test-only exploratory design.
Eleven adults with severe-to-profound bilateral sensorineural hearing loss received delayed sequential CIs.
Speech-in-noise perception was evaluated using standardized sentences and an adaptive procedure to determine signal-to-noise ratio (SNR) for speech reception threshold (SRT).

Main Results:

Minimal and non-statistically significant bilateral benefits were observed for speech-in-noise perception.
The head-shadow effect at 180 degrees demonstrated the most robust bilateral spatial benefit.
Improved perception in spatially distinct conditions suggested a greater contribution from the second CI (CI 2) than the first (CI 1).

Conclusions:

Bilateral benefits in delayed sequential CI recipients are less pronounced than in simultaneous or earlier sequential recipients.
The degree of bilateral benefit appears linked to the availability of the ear with the most favorable SNR.
Delayed implantation may result in reduced binaural integration and benefit.