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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Robotic Cochlear Implantation for Direct Cochlear Access
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InterlACE Sound Coding for Unilateral and Bilateral Cochlear Implants.

Dietmar Michael Wohlbauer, Wai Kong Lai, Norbert Dillier

    IEEE Transactions on Bio-Medical Engineering
    |October 5, 2023
    PubMed
    Summary
    This summary is machine-generated.

    A new cochlear implant strategy, InterlACE, improves speech understanding by alternating signal channels. This method enhances available signal content for both unilateral and bilateral hearing.

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    Area of Science:

    • Auditory Neuroscience
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Cochlear implant (CI) signal processing strategies convert sound to electrical stimulation but face limitations.
    • Technological and anatomical constraints degrade acoustic signals and limit precise auditory nerve excitation.
    • Electrode-neuron interface interactions restrict spectral and temporal precision in CI users.

    Purpose of the Study:

    • To introduce and evaluate a novel CI signal processing strategy, InterlACE.
    • To address limitations in current CI processing by compensating for discarded signal content.
    • To explore the bilateral application of the InterlACE strategy.

    Main Methods:

    • InterlACE replaces maxima selection with spatially and temporally alternating channel selection.
    • The strategy was assessed unilaterally and bilaterally in five bilaterally implanted CI recipients.
    • Evaluations included the Oldenburg Sentence Recognition Test and spectral ripple discrimination.

    Main Results:

    • The InterlACE strategy demonstrated positive effects on speech intelligibility.
    • No significant improvement was observed in spectral ripple discrimination.
    • The method showed potential for increasing available unilateral and bilateral signal content.

    Conclusions:

    • InterlACE processing positively impacts speech intelligibility in cochlear implant users.
    • The strategy may help counteract signal interactions at the electrode-neuron interface.
    • Further research with larger sample sizes is needed to explore clinical impact.