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Speech discrimination in deaf subjects with cochlear implants.

D K Eddington

    The Journal of the Acoustical Society of America
    |September 1, 1980
    PubMed
    Summary

    Multichannel cochlear implants show promise for the profoundly deaf, outperforming single-channel systems in speech perception tasks. These advanced systems offer better auditory nerve stimulation for improved communication.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Audiology

    Background:

    • Investigating electrical stimulation of the auditory nerve for speech communication in the profoundly deaf.
    • Single-channel systems have limited success due to non-specific neural excitation.
    • Multichannel systems offer potential for complex temporal-spatial neural activity patterns.

    Observation:

    • Psychoacoustical experiments confirm distinct neural element excitation by multichannel implant electrodes.
    • New results presented using multiple electrodes and speech-like stimuli (vowels, CV syllables).
    • AXB discrimination tasks evaluated different signal processing schemes and electrode configurations.

    Findings:

    • A four-channel, frequency-selective system achieved faultless discrimination of vowels and CV syllables.
    • Spontaneous vowel recognition was observed with the multichannel system.
    • Single-channel system performance was significantly lower across discrimination tasks.

    Implications:

    • Multichannel cochlear implants demonstrate superior speech perception capabilities compared to single-channel systems.
    • These findings suggest a promising advancement towards restoring speech communication for the profoundly deaf.
    • While full free-running speech understanding is not yet imminent, multichannel systems represent a significant step forward.

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