Comparison of Auditory Efferent System between Normal and Dyslexic Children Using Contralateral Suppression of Transient-Evoked Otoacoustic Emission

Document Type : Original article

Authors

1 Department of Audiology, School of Rehabilitation, Hamadan University of Medical Sciences, Hamadan, Iran

2 Professor, Department of ENT, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran

3 Assotiate Professor, Department of Community Medicine, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran

Abstract

Background and aims: A common complaint of dyslexic children is difficulty in understanding speech in the presence of background noise. Previous studies have suggested that the Medial Olivocochlear Bundle (MOCB) may play a role in speech hearing in noise. The MOCB function can be evaluated by the suppression effect of the Transient Evoked Otoacoustic Emissions (TEOAE) in response to Contralateral Acoustic Stimulation (CAS). The present study was conducted to investigate the suppression effect of TEOAE in dyslexic children.
Materials and Methods: The study groups comprised 32 dyslexic children aged 8–13 years with normal hearing and 32 controls matched for gender and age. The suppression effect of TEOAE was evaluated comparing the TEOAE levels with and without CAS. The dyslexic children were screened by screening inventory reading test.
Results: There were no significant differences in TEOAE inhibition between normal and dyslexic groups. TEOAE amplitude in right ear was higher than that of left ones in dyslexic children while this finding was not observed in the normal group.
Conclusion: The greater amplitude of right TEOAE in dyslexic children can be due to asymmetric performance of MOCB. This pattern was not observed in normal children.

Keywords

Main Subjects

References

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The Scientific Journal of Rehabilitation Medicine
Volume 7, Issue 1
March and April 2018
Pages 93-88

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History

  • Receive Date: 18 February 2017
  • Revise Date: 12 April 2017
  • Accept Date: 08 May 2017
  • First Publish Date: 21 March 2018

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