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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Multisensory training improves auditory spatial processing following bilateral cochlear implantation.

Amal Isaiah1, Tara Vongpaisal1, Andrew J King1

  • 1Department of Physiology, Anatomy & Genetics, University of Oxford, Oxford, OX1 3PT, United Kingdom, and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 15, 2014
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Summary
This summary is machine-generated.

Early deafness impairs sound localization with bilateral cochlear implants (BiCIs). However, multisensory training, combining sound and vision, significantly improved auditory spatial abilities in deaf ferrets with BiCIs.

Keywords:
auditory cortexcochlear implantcross-modal plasticityhearing lossmultisensorysound localization

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Sensory Rehabilitation

Background:

  • Cochlear implants (CIs) offer partial hearing restoration but outcomes can be limited by pre-lingual deafness.
  • Individuals with early-onset hearing loss often struggle with binaural sound processing when using bilateral CIs (BiCIs).
  • Understanding the impact of deafness duration on auditory spatial processing with BiCIs is crucial for improving rehabilitation strategies.

Purpose of the Study:

  • To investigate the effects of early-onset versus late-onset deafness on auditory localization in an animal model with BiCIs.
  • To explore the efficacy of multisensory training in enhancing binaural spatial cue utilization in deafened animals with BiCIs.
  • To examine the neural mechanisms underlying training-induced improvements in auditory spatial processing.

Main Methods:

  • Ferrets were deafened at different ages (hearing onset or adulthood) and received unilateral or bilateral cochlear implants (BiCIs).
  • Auditory localization performance in the horizontal plane was assessed.
  • Multisensory training involving interleaved auditory and visual stimuli was administered to a subset of BiCI-implanted animals.
  • Auditory cortical neuron responsiveness and sensitivity to interaural level differences (ILDs) were measured.

Main Results:

  • Unilaterally implanted animals showed no sound localization ability.
  • Animals with early-onset deafness and BiCIs performed significantly worse on auditory localization than those with late-onset deafness.
  • Multisensory training significantly improved auditory localization performance in early-deafened animals with BiCIs.
  • Training enhanced auditory cortical neuron responsiveness and ILD sensitivity, suggesting cross-modal plasticity.

Conclusions:

  • Early-onset deafness significantly impairs auditory spatial processing with bilateral cochlear implants.
  • Multisensory training, incorporating visual input, can effectively restore auditory spatial abilities in individuals with early-onset deafness and BiCIs.
  • Vision plays a facilitative role in auditory spatial processing following cross-modal reorganization, supporting potential therapeutic applications in human CI users.