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Related Experiment Videos

Functioning of olivocochlear bundle and speech perception in noise.

U Ajith Kumar1, C S Vanaja

  • 1Department of Audiology, All India Institute of Speech & Hearing, Mysore, Karnataka, India. ajithajitkumar18@rediffmail.com

Ear and Hearing
|April 6, 2004
PubMed
Summary

Contralateral acoustic stimuli improved speech perception in children with normal hearing, especially in noisy environments. This enhancement correlated with otoacoustic emission suppression, suggesting the medial olivocochlear bundle aids hearing.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Otoacoustic Emissions

Background:

  • The medial olivocochlear (MOC) bundle plays a role in auditory processing.
  • Contralateral acoustic stimuli can modulate otoacoustic emissions (OAEs).
  • The effect of contralateral sound on speech perception in children is not fully understood.

Purpose of the Study:

  • To investigate the impact of contralateral acoustic stimuli on speech identification in normal-hearing children.
  • To correlate speech perception improvements with contralateral suppression of transient evoked otoacoustic emissions (TEOAEs).

Main Methods:

  • Speech identification scores were measured in quiet and noise with and without contralateral acoustic stimuli.
  • Transient evoked otoacoustic emissions (TEOAEs) were recorded under similar acoustic conditions.

Related Experiment Videos

  • Ten normal-hearing children participated in the study.

    • Main Results:

    • Contralateral acoustic stimuli significantly enhanced speech perception at +10 dB and +15 dB signal-to-noise ratios.
    • This enhancement in speech identification showed a significant positive correlation with contralateral suppression of OAEs.
    • The findings suggest a functional link between efferent auditory pathways and speech processing in noise.

    Conclusions:

    • The medial olivocochlear bundle may contribute to improved speech perception in challenging listening conditions.
    • Cochlear efferent pathways likely play a role in auditory function.
    • Psychoacoustic measures can serve as a viable alternative for evaluating efferent auditory pathways when OAEs cannot be recorded.