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Binaural speech recognition and the Stenger effect.

S A Karsten1, C W Turner

  • 1University of Iowa, Iowa City 52242, USA.

Journal of Speech, Language, and Hearing Research : JSLHR
|June 2, 2001
PubMed
Summary

Altering sound levels between ears in individuals with hearing loss did not significantly impact speech recognition. Binaural interference and the Stenger effect had minimal influence on scores.

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Area of Science:

  • Audiology
  • Speech-Language Pathology
  • Neuroscience

Background:

  • Bilateral asymmetrical sensorineural hearing impairment affects sound perception in each ear differently.
  • Understanding binaural hearing is crucial for optimizing hearing aid fitting and audiological rehabilitation.
  • Previous research has explored sound localization and speech intelligibility in individuals with hearing loss.

Purpose of the Study:

  • To investigate the impact of varying sound presentation levels between ears on speech recognition in listeners with bilateral asymmetrical sensorineural hearing impairments.
  • To determine the extent of binaural interference and the influence of the Stenger effect on speech recognition scores in this population.
  • To assess whether speech recognition scores reflect the better ear's capabilities even when the poorer ear receives amplified sound.

Main Methods:

  • Twelve participants with bilateral asymmetrical sensorineural hearing impairments were recruited.
  • Speech-recognition scores were measured using /VCV/ speech stimuli in quiet.
  • Nine listening conditions were tested, ranging from monaural presentation to binaural presentation with systematic 5-dB steps in sound level balance between ears.

Main Results:

  • Varying the sound level in the better ear within a -20 to +10 dB range relative to the poorer ear did not significantly alter group speech recognition scores.
  • No evidence of binaural interference was observed in the study.
  • The Stenger effect demonstrated minimal influence on speech recognition scores in binaural listening situations.

Conclusions:

  • Sound level balancing between ears within a specific range has limited impact on speech recognition for individuals with bilateral asymmetrical sensorineural hearing loss.
  • Binaural interference and the Stenger effect appear to have negligible effects on speech recognition in this population.
  • Speech recognition performance in binaural conditions is primarily determined by the capabilities of the better hearing ear.

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