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Related Concept Videos

Anatomical Movements00:51

Anatomical Movements

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Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
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A digital audio workstation approach for matching the sound quality of speech and music for single-sided deaf patients fit with cochlear implants.

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Cochlear Implant Sound Quality.

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Close approximations to the sound of a cochlear implant.

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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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Head Movements Allow Listeners Bilaterally Implanted With Cochlear Implants to Resolve Front-Back Confusions.

M Torben Pastore1, Sarah J Natale, William A Yost

  • 1Department of Speech and Hearing Science, Arizona State University, Tempe, AZ.

Ear and Hearing
|April 18, 2018
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Summary

Bilateral cochlear implant (CI) users can reduce front-back sound localization errors by moving their heads. Head movements significantly improve sound source identification for CI patients, suggesting real-world abilities exceed static lab tests.

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Sound localization is crucial for auditory perception and spatial awareness.
  • Cochlear implants (CIs) aim to restore hearing but can present challenges in sound localization.
  • Front-back confusions are common in CI users, impacting their ability to discern sound source direction.

Purpose of the Study:

  • To investigate the ability of bilateral CI users to distinguish sound source locations (front-back) with and without head movements.
  • To determine if CI users are more prone to front-back confusions than normal-hearing individuals.
  • To assess if dynamic binaural cues and head rotation can resolve front-back confusions in CI users.

Main Methods:

  • Seven bilateral CI users and five normal-hearing controls participated.
  • Gaussian noise stimuli (2-8 kHz) were presented from six directions.
  • Localization was tested with stationary heads and with self-initiated head rotation (±30°).
  • Tests were repeated with one CI deactivated to assess monaural performance.

Main Results:

  • Bilateral CI users exhibited high front-back confusion rates (41.9%) with stationary heads.
  • Head rotation significantly reduced front-back confusions to 6.7%.
  • Monaural listening severely degraded localization acuity, with head movement having minimal impact.

Conclusions:

  • Bilateral CIs enable users to utilize dynamic auditory cues and head position for improved sound localization.
  • Head movements are critical for CI users to resolve front-back ambiguities.
  • Static laboratory assessments may underestimate the real-world sound localization capabilities of bilateral CI users.