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Related Experiment Videos

Investigations towards an artificial cochlea.

E S Hochmair, I J Hochmair-Desoyer, K Burian

    The International Journal of Artificial Organs
    |September 1, 1979
    PubMed
    Summary

    Cochlear implants with bipolar stimulation offer discrete auditory nerve stimulation for speech processing. However, different deafness types significantly impact auditory prosthesis design and function.

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    Area of Science:

    • Audiology
    • Biomedical Engineering
    • Neuroscience

    Background:

    • Cochlear implants are vital for hearing restoration.
    • Multichannel cochlear stimulators aim for discrete auditory nerve activation.
    • Understanding stimulation modes (unipolar vs. bipolar) is crucial for optimizing performance.

    Purpose of the Study:

    • To compare the efficacy of two multichannel cochlear stimulator versions: unipolar and bipolar stimulation.
    • To assess the potential for discrete auditory nerve stimulation and tonotopic mapping with both methods.
    • To investigate the influence of deafness etiology on psychophysical responses to cochlear stimulation.

    Main Methods:

    • Implantation of two versions of multichannel cochlear stimulators.
    • Evaluation of discrete stimulation capabilities for tonotopic processing.
    • Psychophysical testing to assess stimulus frequency influence on perceived pitch.
    • Comparison of results between subjects with prelingual and acquired deafness.

    Main Results:

    • Both unipolar and bipolar stimulation allowed for discrete auditory nerve stimulation, enabling tonotopy for speech processing.
    • Bipolar stimulation exhibited higher thresholds and a narrower frequency range for pitch perception compared to unipolar stimulation.
    • Significant differences in psychophysical behavior were observed between subjects with prelingual and acquired deafness.

    Conclusions:

    • Multichannel cochlear stimulators can achieve discrete auditory nerve stimulation for speech processing.
    • Bipolar stimulation presents specific characteristics regarding thresholds and pitch perception.
    • The etiology of deafness is a critical factor influencing the design and effectiveness of auditory prostheses.

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