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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Training improves cochlear implant rate discrimination on a psychophysical task.

Raymond L Goldsworthy1, Robert V Shannon2

  • 1Sensimetrics Corporation, Research & Development, 14 Summer Street, Suite 305, Malden, Massachusetts 02148.

The Journal of the Acoustical Society of America
|January 21, 2014
PubMed
Summary

Cochlear implant (CI) users can significantly improve their ability to distinguish electrical pulse rates through dedicated training. This study shows that over 32 hours of practice enhances CI rate discrimination, benefiting hearing perception.

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Area of Science:

  • Auditory Neuroscience
  • Speech and Hearing Science
  • Biomedical Engineering

Background:

  • Cochlear implants (CIs) are vital for hearing restoration in individuals with severe to profound sensorineural hearing loss.
  • Effective sound processing in CIs relies on the brain's ability to interpret temporal patterns, such as pulse rate.
  • Improving temporal processing, like rate discrimination, is crucial for enhancing speech understanding and overall auditory perception in CI users.

Purpose of the Study:

  • To quantify the extent to which auditory training can enhance rate discrimination abilities in adult cochlear implant (CI) users.
  • To investigate the impact of training across different electrode locations and stimulus presentation rates.
  • To examine the influence of procedural variations, such as amplitude variability and modulation, on rate discrimination performance.

Main Methods:

  • Six adult CI users participated in 32 hours of auditory training and assessment focused on rate discrimination.
  • Rate difference limens (DLs) were measured using biphasic pulse trains across various frequencies (110–3520 Hz) and electrode positions (apical to basal).
  • Stimuli were loudness-balanced, and procedural variations included level roving and amplitude modulation to assess their effects.

Main Results:

  • A significant improvement in rate discrimination, exceeding a factor of 2, was observed across all participants, electrodes, and standard rates.
  • Factor analysis revealed that the training benefits were consistent across all tested electrode locations and standard rates.
  • Neither level roving nor amplitude modulation significantly impacted the measured rate DLs, suggesting robustness of the training effect.

Conclusions:

  • Auditory training is a highly effective method for significantly improving psychophysical rate discrimination in cochlear implant users.
  • The benefits of training are widespread, impacting performance across different stimulation sites within the cochlea.
  • These findings support the integration of targeted training protocols to optimize auditory function and communication outcomes for individuals with CIs.