Does Contralateral Inhibition of Transient Evoked Otoacoustic Emissions Suggest Sex or Ear Laterality Effects? Purpose The purpose of this study was to examine contralateral inhibition of transient evoked otoacoustic emissions (TEOAEs) in young adults with normal hearing as a function of ear and sex. Method Young female (n = 50) and male (n = 50) adults with normal hearing participated. TEOAEs were ... Research Article
Research Article  |   September 12, 2018
Does Contralateral Inhibition of Transient Evoked Otoacoustic Emissions Suggest Sex or Ear Laterality Effects?
 
Author Affiliations & Notes
  • Andrew Stuart
    East Carolina University, Greenville, NC
  • Alyssa N. Kerls
    East Carolina University, Greenville, NC
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Andrew Stuart: stuarta@ecu.edu
  • Editor-in-Chief: Sumitrajit Dhar
    Editor-in-Chief: Sumitrajit Dhar×
  • Editor: Ann Eddins
    Editor: Ann Eddins×
Article Information
Hearing & Speech Perception / Hearing Disorders / Research Articles
Research Article   |   September 12, 2018
Does Contralateral Inhibition of Transient Evoked Otoacoustic Emissions Suggest Sex or Ear Laterality Effects?
American Journal of Audiology, September 2018, Vol. 27, 272-282. doi:10.1044/2018_AJA-17-0106
History: Received November 10, 2017 , Revised January 20, 2018 , Accepted March 26, 2018
 
American Journal of Audiology, September 2018, Vol. 27, 272-282. doi:10.1044/2018_AJA-17-0106
History: Received November 10, 2017; Revised January 20, 2018; Accepted March 26, 2018

Purpose The purpose of this study was to examine contralateral inhibition of transient evoked otoacoustic emissions (TEOAEs) in young adults with normal hearing as a function of ear and sex.

Method Young female (n = 50) and male (n = 50) adults with normal hearing participated. TEOAEs were measured bilaterally with 80 dB peSPL nonlinear clicks and 60 dB peSPL linear clicks with and without a contralateral broadband noise elicitor at 65 dB SPL. Absolute TEOAE inhibition and normalized TEOAE inhibition (i.e., percentage of inhibition) were examined.

Results With both 80 and 60 dB peSPL evoking stimuli, there were significant main effects of ear and sex (p < .05). TEOAE levels were larger in women and in the right ear. There were no statistically significant main effects of ear and sex on absolute TEOAE inhibition (p > .05). Significant main effects of ear and sex were, however, found with normalized TEOAE inhibition (p < .05; greater in men and in the left ear). Statistically significant negative correlations and significant linear predictive relations were found between TEOAE levels and normalized TEOAE inhibitions in both ears (p < .001). There is no evidence of the same with absolute inhibition of TEOAEs (p > .05).

Conclusions If one considers that efferent inhibition of TEOAEs is an absolute quantity, the significant effect of ear and sex on normalized inhibition and the negative association and linear predictive relationship between TEOAE level and inhibition can be viewed as spurious effects. As such, contralateral inhibition of TEOAEs does not suggest sex or ear laterality effects.

Acknowledgments
This study was presented in part at the 2017 American Academy of Audiology AudiologyNOW! Convention, Indianapolis, IN.
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