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Related Experiment Videos

Modeling binaural loudness.

Brian C J Moore1, Brian R Glasberg

  • 1Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, England. bcjm@cam.ac.uk

The Journal of the Acoustical Society of America
|April 6, 2007
PubMed
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Binaural loudness summation is imperfect, with sounds perceived as less than twice as loud with two ears versus one. A modified loudness model incorporates inhibitory interactions between ears for more accurate predictions of perceived sound loudness.

Area of Science:

  • Acoustics
  • Psychoacoustics
  • Auditory Perception

Background:

  • Binaural sound presentation results in loudness summation across ears, but this summation is less than perfect.
  • Existing loudness models, like Moore et al.'s, often use simple summation, which may not accurately predict perceived loudness for all binaural stimuli.
  • Differences in sound level or frequency between the ears can further complicate loudness perception.

Purpose of the Study:

  • To modify an existing loudness model to improve predictions for binaurally presented sounds.
  • To account for imperfect loudness summation and discrepancies in sound level or frequency between the ears.
  • To incorporate the concept of inhibitory interactions between auditory signals presented to each ear.

Main Methods:

Related Experiment Videos

  • Surveying existing data on binaural loudness perception.
  • Modifying the Moore et al. loudness model by introducing inhibitory interactions between internal representations of signals at the left and right ears.
  • Assuming inhibition spreads across frequency channels.

    • Main Results:

    • The modified model provides more accurate predictions of binaural loudness compared to the original model.
    • The model successfully accounts for cases where sounds at the two ears differ in level, frequency, or both.
    • Predictions align well with experimental data obtained through loudness scaling and matching procedures.

    Conclusions:

    • Inhibitory interactions between auditory signals presented to each ear are crucial for accurately modeling binaural loudness perception.
    • The modified model offers a more refined approach to predicting perceived loudness for complex binaural stimuli.
    • This research enhances our understanding of auditory processing and loudness perception in humans.