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Related Concept Videos

Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Related Experiment Video

Updated: Oct 29, 2025

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Toward an Individual Binaural Loudness Model for Hearing Aid Fitting and Development.

Iko Pieper1, Manfred Mauermann1, Birger Kollmeier1

  • 1Medizinische Physik and Cluster of Excellence Hearing4All, Universität Oldenburg, Oldenburg, Germany.

Frontiers in Psychology
|July 9, 2021
PubMed
Summary

Individualized loudness models (ILMs) for hearing aids need more than basic gain/attenuation adjustments. New parameters for binaural summation and spectral processing are crucial for accurately predicting loudness perception in hearing-impaired individuals.

Keywords:
binaural inhibitionbinaural loudness summationbinaural summationhearing aidhearing impairmentloudness functionloudness summation

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Area of Science:

  • Audiology
  • Psychoacoustics
  • Hearing Science

Background:

  • Individual loudness perception significantly impacts hearing aid satisfaction.
  • Current loudness models for the hearing impaired (HI) often lack personalization.
  • Individualized loudness models (ILMs) could enhance hearing aid fitting and development.

Purpose of the Study:

  • To determine if additional parameters beyond cochlear gain loss and linear attenuation are needed for ILMs.
  • To investigate spectral and binaural loudness summation in normal hearing (NH) and HI listeners.
  • To assess the interdependence of spectral and binaural summation for personalized loudness prediction.

Main Methods:

  • Loudness perception was measured in eight NH and eight HI listeners across various auditory conditions (monaural/binaural, narrowband/broadband).
  • A binaural summation stage was developed using empirical monaural loudness judgments.
  • A recent monaural loudness model was extended with the proposed binaural stage to evaluate parameter requirements.

Main Results:

  • Normal hearing (NH) listeners exhibited binaural inhibition, consistent with existing literature.
  • Hearing-impaired (HI) listeners showed increased binaural summation and greater inter-subject variability.
  • A bandwidth-dependent monaural parameter and a binaural summation parameter were necessary for accurate ILMs.

Conclusions:

  • Individualized binaural summation is essential for accurate loudness modeling in HI listeners.
  • A bandwidth-dependent spectral summation parameter is also required for comprehensive ILMs.
  • These findings advance the development of personalized hearing aid processing.