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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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Abnormal binaural spectral integration in cochlear implant users.

Lina A J Reiss1, Rindy A Ito, Jessica L Eggleston

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Bimodal hearing with cochlear implants (CI) and hearing aids (HA) can be inconsistent. Abnormal binaural spectral integration (BSI) may explain why some users experience interference, not benefit, from combined devices.

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Area of Science:

  • Auditory Neuroscience
  • Audiology
  • Bioacoustics

Background:

  • Bimodal stimulation (cochlear implant [CI] + contralateral hearing aid [HA]) offers variable benefits for speech perception in noise.
  • Abnormal auditory experiences, particularly interaural pitch mismatches from CI programming, may contribute to this variability.
  • Differences in binaural spectral integration (BSI) are hypothesized to affect bimodal stimulation outcomes.

Purpose of the Study:

  • To investigate if broadened BSI can mitigate the perception of interaural pitch mismatch in bimodal CI users.
  • To explore the relationship between BSI, pitch perception, and device integration in individuals using both a CI and an HA.

Main Methods:

  • Measured interaural pitch mismatches and dichotic pitch fusion ranges in 21 bimodal CI users.
  • Assessed pitch matching of fused electrode-tone pairs in 17 subjects with wide fusion ranges.
  • Quantified the size of fusion ranges and correlated it with interaural pitch mismatch.

Main Results:

  • All subjects exhibited abnormally wide dichotic pitch fusion ranges (1-4 octaves).
  • A weak correlation was found between fusion range size and interaural pitch mismatch.
  • Dichotic pitch averaging occurred, creating a new binaural pitch from widely differing monaural pitches (up to 3-4 octaves).

Conclusions:

  • Abnormal BSI, characterized by wide fusion ranges and spectral averaging, is evident in bimodal CI users.
  • These BSI abnormalities may underlie speech perception interference and suboptimal integration with bimodal hearing devices.
  • Understanding BSI is crucial for optimizing bimodal hearing device fitting and improving outcomes.