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Updated: Jun 22, 2026
03:49
Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode
Published on: October 11, 2024
Achieving electric-acoustic benefit with a modulated tone
Christopher A Brown1, Sid P Bacon
1Department of Speech and Hearing Science, Arizona State University, Tempe, Arizona, USA.
Ear and Hearing
|June 24, 2009
Summary
A modulated tone carrying fundamental frequency (F0) and amplitude envelope cues significantly improved speech intelligibility in cochlear implant (CI) users. This finding suggests new technological avenues for enhancing electric-acoustic stimulation (EAS) benefits.
Area of Science:
- Audiology
- Neuroscience
- Biomedical Engineering
Background:
- Cochlear implants (CI) with electric-acoustic stimulation (EAS) enhance speech intelligibility in noise.
- Previous simulations showed a modulated tone could mimic EAS benefits.
Purpose of the Study:
- To evaluate the intelligibility benefits of a modulated tone in CI patients.
- To compare the tone's benefit against traditional EAS with target speech.
Main Methods:
- Eight CI users with residual hearing participated.
- Stimulation included electric-only, electric-acoustic target speech, and electric-modulated tone.
- Speech intelligibility was tested in multitalker babble and single-talker noise.
Main Results:
- All participants showed improved intelligibility with acoustic stimulation (tone or speech) over electric-only.
- The modulated tone improved intelligibility by an average of 46 percentage points.
- Acoustic target speech improved intelligibility by an average of 55 percentage points.
Conclusions:
- A tone conveying F0 and amplitude envelope cues significantly benefits CI users.
- This approach may extend EAS benefits to patients unsuitable for current EAS methods.
- Potential for novel technologies to improve hearing in CI recipients.
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