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Related Concept Videos

The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Perceiving Loudness, Pitch, and Location01:21

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
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Related Experiment Video

Updated: Oct 6, 2025

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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Frequency reallocation based on cochlear place frequencies in cochlear implants: a pilot study.

Flavia Di Maro1, Marco Carner2, Andrea Sacchetto3

  • 1Otolaryngology-Head and Neck Surgery Department, University Hospital of Verona, Piazzale Aristide Stefani, 1, 37126, Verona, Italy. fldm22@gmail.com.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
|January 15, 2022
PubMed
Summary
This summary is machine-generated.

Frequency reallocation using Otoplan® software improved speech perception in postlingually deafened cochlear implant patients. This anatomical mapping approach led to significant reductions in speech recognition and awareness thresholds, enhancing overall outcomes.

Keywords:
Anatomy-based fittingCochlear implantFrequency reallocationFrequency-to-place mismatch

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Area of Science:

  • Audiology
  • Neurosurgery
  • Medical Imaging

Background:

  • Cochlear implantation is a common treatment for postlingual deafness.
  • Optimizing electrode placement and frequency mapping is crucial for speech perception outcomes.
  • Otoplan® software offers a method for creating anatomically based cochlear maps from CT images.

Purpose of the Study:

  • To evaluate speech perception outcomes after frequency reallocation using an anatomically based map generated by Otoplan® software.
  • To assess the impact of Otoplan®-derived frequency reallocation on audiometric measures in cochlear implant recipients.

Main Methods:

  • A retrospective study included ten postlingually deafened patients with MED-EL cochlear implants.
  • Postoperative CT scans were analyzed using Otoplan® to obtain intracochlear electrode positions and create an anatomical map.
  • Patients underwent pure tonal and speech audiometry before and after frequency reallocation, measuring Speech Recognition Threshold (SRT), Speech Awareness Threshold (SAT), and Pure Tone Average (PTA).

Main Results:

  • Significant reductions in mean SRT (61.25 dB to 51.25 dB, p=0.02) and SAT (49 dB to 41 dB, p=0.04) were observed after frequency reallocation.
  • No significant difference was found in Pure Tone Average (PTA) values (41.5 dB to 39.25 dB, p=0.18).

Conclusions:

  • Anatomical mapping and frequency reallocation using Otoplan® software show promise for improving speech discrimination in postlingually deafened cochlear implant patients.
  • The findings suggest better adaptation and speech perception following this individualized approach to frequency mapping.