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[Modification of cochlear active micromechanism by auditory cortex].

H Wang1, N Zhong

  • 1Department of Otolaryngology, Union Hospital, Tongji Medical University, Wuhan 430022.

Zhonghua Er Bi Yan Hou Ke Za Zhi
|May 27, 2003
PubMed
Summary
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The auditory cortex modulates outer hair cell function via efferent pathways to the cochlea, influencing hearing sensitivity. Selective attention and decerebration studies confirm this top-down control of the auditory system.

Area of Science:

  • Neuroscience
  • Auditory Physiology
  • Otoacoustic Emissions

Context:

  • The auditory cortex plays a role in modulating auditory perception.
  • Outer hair cells (OHCs) are crucial for hearing sensitivity through their active micromechanism.
  • The efferent auditory system's influence on cochlear function requires further elucidation.

Purpose:

  • To investigate the auditory cortex's influence on the active micromechanism of outer hair cells.
  • To determine if selective attention affects distortion product otoacoustic emissions (DPOAEs) in humans.
  • To examine the impact of decerebration on DPOAEs in guinea pigs.

Summary:

  • Selective attention tasks significantly suppressed DPOAEs in humans at 1 kHz and 2 kHz.
  • Decerebration in guinea pigs led to a significant reduction in DPOAEs.

Related Experiment Videos

  • These findings support the existence of efferent innervation from the auditory cortex to the cochlea, modulating OHC function.

    • Impact:

    • Demonstrates top-down control of cochlear mechanics by the auditory cortex.
    • Highlights the role of efferent pathways in auditory processing and efferent modulation.
    • Provides insights into the neural mechanisms underlying auditory attention and hearing.