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Related Experiment Video

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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Low variable rate stimulation strategy for cochlear implants using temporal cues and electrophysiological factors.

Elham Zarei1, Hamed Sadjedi2, Mohammad Farhadi3

  • 1Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Technology and Health Care : Official Journal of the European Society for Engineering and Medicine
|July 12, 2018
PubMed
Summary

A new cochlear implant (CI) stimulation algorithm enhances speech emotion perception by utilizing temporal fine-structure cues and patient-specific electrophysiology. This method improves accuracy and reduces stimulation pulses, benefiting CI users.

Keywords:
Cochlear implantelectrical stimulationemotion detectionexcitable nerve fibervoice pitch frequency

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Area of Science:

  • Biomedical Engineering
  • Auditory Neuroscience
  • Signal Processing

Background:

  • Cochlear implant (CI) performance, particularly in pitch perception, is significantly influenced by the electrical stimulation strategy employed.
  • Existing strategies often face limitations in effectively conveying complex auditory information like emotional nuances in speech.

Purpose of the Study:

  • To introduce a novel variable-rate stimulation algorithm for cochlear implants.
  • To enhance speech emotion perception by integrating temporal fine-structure cues and patient-specific electrophysiological parameters.

Main Methods:

  • The algorithm encodes phase information at peak intervals of band-passed signals, generating stimulation pulses at peak occurrences.
  • It calculates discharge probability using an excitable fiber model, incorporating patient-specific thresholds and fiber distribution.
  • This approach aims to excite auditory nerve fibers with a discharge probability above a defined threshold.

Main Results:

  • Listeners achieved an average emotion detection accuracy of 83.82% with the proposed algorithm, outperforming zero-crossing (75%) and continuous interleaved sampling (CIS) (48.03%).
  • The number of stimulation pulses was significantly reduced by 76.3% compared to zero-crossing and 75.4% compared to CIS.
  • The study utilized the Persian emotional speech database (Persian ESD) for testing.

Conclusions:

  • The proposed stimulation method for cochlear implants, considering patient biological parameters, successfully transmits speech emotion.
  • Reduced stimulation pulses offer advantages, including minimized current field interactions between electrodes and lower battery consumption.
  • This personalized approach represents a significant advancement in cochlear implant technology for improved auditory communication.