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Related Experiment Videos

The interaction between ear and sex differences and stimulus rate.

Hasnaa Ismail1, A Roger D Thornton

  • 1MRC Institute of Hearing Research, Royal South Hants Hospital, Southampton SO14 0YG, UK.

Hearing Research
|May 14, 2003
PubMed
Summary

Maximum length sequence evoked otoacoustic emissions (EOAEs) show that females have larger amplitudes than males. As click stimulus rates increase, this difference in cochlear function measure diminishes.

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Area of Science:

  • Audiology
  • Otoacoustic Emissions
  • Cochlear Physiology

Background:

  • Evoked otoacoustic emissions (EOAEs) offer objective, non-invasive assessment of cochlear function.
  • Conventional EOAEs reveal amplitude differences between sexes and ears.
  • Maximum length sequences (MLS) enable higher stimulus rates for EOAE testing.

Purpose of the Study:

  • To investigate sex and ear differences in MLS EOAEs.
  • To determine the effect of stimulus rate on MLS EOAEs.
  • To establish normative data for MLS EOAE testing in normally hearing adults.

Main Methods:

  • Tested 80 normally hearing adults (18-40 years).
  • Recorded MLS EOAEs at eight stimulus rates (40/s to 5000/s).
  • Utilized two stimulus levels and two recordings per rate.

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Main Results:

  • Females exhibited statistically significant larger MLS OAE amplitudes than males.
  • Right ears showed larger amplitudes than left ears in females.
  • MLS OAE amplitude decreased as stimulus rate increased.

Conclusions:

  • MLS EOAEs confirm greater amplitude in females compared to males.
  • The amplitude difference between sexes decreases with increasing stimulus rate.
  • Normative data support MLS EOAEs as a viable clinical tool for assessing cochlear function.