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Auditory-pupillary responses in deaf subjects.

Naoharu Kitajima1, Koji Otsuka, Yasuo Ogawa

  • 1Department of Otolaryngology, Tokyo Medical University, Nishishinjuku, Shinjuku-ku, Tokyo, Japan. medart@js6.sonet.ne.jp

Journal of Vestibular Research : Equilibrium & Orientation
|September 10, 2010
PubMed
Summary

The auditory-pupillary response, linked to hearing and balance, occurs even in deaf individuals. This suggests a connection to vestibular function, offering a new way to assess balance disorders.

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Area of Science:

  • Neuroscience
  • Otolaryngology
  • Autonomic Nervous System Research

Background:

  • Pupillary dilation to sound is typically viewed as a startle reflex.
  • This study investigates if the auditory-pupillary response involves more than just sound, potentially including vestibular input.

Purpose of the Study:

  • To explore the relationship between auditory-pupillary responses and vestibular function.
  • To determine if auditory-pupillary responses are present in individuals with bilateral deafness.

Main Methods:

  • Utilized computer pupillography to measure auditory-pupillary responses in both eyes.
  • Recruited 8 healthy volunteers and 12 subjects with bilateral deafness.

Main Results:

  • Auditory-pupillary responses were observed in subjects with bilateral deafness.

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  • The magnitude of these responses in deaf subjects was comparable to that in normal-hearing subjects.

    • Conclusions:

    • The auditory-pupillary response is not solely a startle reflex to sound but also involves vestibular system input.
    • Assessing auditory-pupillary responses may aid in evaluating vestibulo-autonomic function, particularly in peripheral disequilibrium conditions.