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Related Experiment Videos

Minimum audible angle, just noticeable interaural differences and speech intelligibility with bilateral cochlear

Pascal Senn1, Martin Kompis, Mattheus Vischer

  • 1Department of ENT, Head and Neck Surgery, Inselspital, University of Berne, Berne, Switzerland.

Audiology & Neuro-Otology
|August 17, 2005
PubMed
Summary

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Bilateral cochlear implants (CI) improve sound localization and speech understanding, especially in front. Patients showed near-normal intensity differences but struggled with time differences, impacting sound perception.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implants (CI) aim to restore hearing in individuals with severe to profound hearing loss.
  • Bilateral CI involves implanting devices in both ears to potentially improve spatial hearing and speech comprehension.
  • Understanding the benefits and limitations of bilateral CI is crucial for optimizing patient outcomes.

Purpose of the Study:

  • To evaluate sound localization and speech intelligibility in patients with bilateral cochlear implants (CI).
  • To compare the performance of bilateral CI with unilateral CI and age-matched normal hearing controls.
  • To investigate the impact of interaural intensity and time differences on auditory perception in CI users.

Main Methods:

  • Assessed minimum audible angle (MAA) for sound localization in the horizontal plane using white noise bursts.

Related Experiment Videos

  • Measured just noticeable differences (JNDs) in interaural intensity and time using various auditory stimuli.
  • Evaluated speech intelligibility in quiet and noise using the German HSM sentence test.

    • Main Results:

    • Bilateral CI users demonstrated good spatial discrimination in front and back but poor performance on the sides.
    • Near-normal interaural intensity JNDs were observed, but interaural time JNDs were significantly poorer, especially for fine structure cues.
    • Speech intelligibility was significantly better with bilateral CI compared to unilateral CI, primarily due to the head shadow effect.

    Conclusions:

    • Bilateral CI enhances spatial discrimination in front and improves speech intelligibility, particularly in noisy environments.
    • Limitations in perceiving interaural time differences, especially fine structure, may affect overall sound localization accuracy.
    • The findings support the use of bilateral CI for improved auditory rehabilitation, aligning with positive subjective patient experiences.