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Experience with bilateral cochlear implants improves sound localization acuity in children.

Shelly P Godar¹, Ruth Y Litovsky

¹Waisman Center, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|September 25, 2010

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Bilateral cochlear implants (CIs) improve spatial hearing in children. Skills developed with experience, showing better performance with two CIs compared to one, enhancing sound localization abilities.

Area of Science:

Auditory neuroscience
Pediatric audiology
Cochlear implant technology

Background:

Increasing use of bilateral cochlear implants (CIs) for deaf children.
Importance of acoustic cues for spatial hearing development.
Minimum Audible Angle (MAA) as a measure of spatial hearing ability.

Purpose of the Study:

To investigate the development of spatial hearing skills in children transitioning to bilateral CIs.
To assess the impact of bilateral versus unilateral CI use on spatial hearing.
To evaluate the role of auditory plasticity in acquiring spatial hearing with CIs.

Main Methods:

Longitudinal study of 10 children (5-10 years) undergoing sequential bilateral CI implantation.
Measurement of Minimum Audible Angle (MAA) before and at 3 and 12 months after bilateral activation.

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Comparison of spatial hearing performance in bilateral, unilateral, and baseline conditions.

Main Results:

Significant improvement in MAA from 44.8 degrees at baseline to 20.4 degrees (3 months) and 16.8 degrees (12 months) with bilateral CIs.
Unilateral CI use showed no improvement in MAA.
Bilateral CI listening demonstrated superior spatial hearing compared to unilateral listening.

Conclusions:

Spatial hearing skills in children with sequential bilateral CIs improve with experience.
The auditory system's plasticity allows for the utilization of bilateral electrical stimulation for enhanced sound localization.
Bilateral CIs are more effective than unilateral CIs for developing spatial hearing.