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Background <p>Hidden hearing loss can be observed and exacerbated by noise when the medial olivocochlear bundle is lesioned.</p> Purpose <p>Assess the medial olivocochlear reflex (MOCR) in right-handed persons with normal hearing, using auditory brainstem response (ABR).</p> Subjects and methods <p>The current study included 20 normal-hearing, right-handed subjects, their mean age was 29.2 ± 7.48&#xa0;years, with no history of neuro-otological diseases. ABR waves were recorded from both sides at different sound levels for all participants with and without contralateral acoustic stimulation (CAS).</p> Results <p>On the recording of ABR waves starting by the left ear with CAS to the right ear, there was a statistically significant lower amplitude of Wave I (at 50 dBnHL) and Wave V (at 50 and 70 dBnHL). There was a statistically significant higher suppression effect (SE) on the left than right ear in Wave I (at 50 dBnHL) and Wave V (at 60 and 70 dBnHL). There were no statistically significant differences between all participants regarding the latency and ABR threshold level with CAS and without CAS.</p> Conclusion <p>the current study revealed amplitude reduction of ABR waves especially Wave V, with more effectiveness of the MOCR suppression effect on the right than the left ear.</p>

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Assessment of the medial olivocochlear reflex in normal-hearing right-handed subjects using auditory brainstem response: a pilot study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月16日

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  • Ahmed Zein-Elabedein,
  • Ahmed Ragab,
  • Hosam Sanyelbhaa,
  • Ahlam Diab,
  • Asmaa Moaty

摘要

Background

Hidden hearing loss can be observed and exacerbated by noise when the medial olivocochlear bundle is lesioned.

Purpose

Assess the medial olivocochlear reflex (MOCR) in right-handed persons with normal hearing, using auditory brainstem response (ABR).

Subjects and methods

The current study included 20 normal-hearing, right-handed subjects, their mean age was 29.2 ± 7.48 years, with no history of neuro-otological diseases. ABR waves were recorded from both sides at different sound levels for all participants with and without contralateral acoustic stimulation (CAS).

Results

On the recording of ABR waves starting by the left ear with CAS to the right ear, there was a statistically significant lower amplitude of Wave I (at 50 dBnHL) and Wave V (at 50 and 70 dBnHL). There was a statistically significant higher suppression effect (SE) on the left than right ear in Wave I (at 50 dBnHL) and Wave V (at 60 and 70 dBnHL). There were no statistically significant differences between all participants regarding the latency and ABR threshold level with CAS and without CAS.

Conclusion

the current study revealed amplitude reduction of ABR waves especially Wave V, with more effectiveness of the MOCR suppression effect on the right than the left ear.