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Temporal integration contributes to the masking release by amplitude modulation.

Hisaaki Tabuchi1, Bernhard Laback2

  • 1Department of Psychology, University of Innsbruck, Innrain 52f, 6020 Innsbruck, Austria.

Hearing Research
|May 24, 2022
PubMed
Summary

Masking release (MR) occurs when modulated sounds are less masking than unmodulated ones. This study shows temporal integration across masker dips contributes to MR, especially with longer sounds.

Keywords:
CompressionDip-listening integrationEnvelope fluctuationMOCMultiple-looks integrationPhysiology-based auditory modelSchroeder-phase harmonic complexSimultaneous maskingTemporal integration

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing in Hearing

Background:

  • Modulated maskers create less masking than unmodulated maskers, an effect known as masking release (MR).
  • Potential mechanisms for MR include listening in temporal dips and rapid cochlear compression.
  • This study investigates the contribution of temporal integration in masker dips to MR.

Purpose of the Study:

  • To determine the role of dip listening in masking release (MR).
  • To measure temporal integration in simultaneous masking using Schroeder-phase harmonic complexes (SPHC).
  • To evaluate a physiology-inspired model's ability to predict MR based on temporal envelope modulation.

Main Methods:

  • Six normal-hearing listeners participated in the experiment.
  • Stimuli included SPHC maskers and pure-tone targets, with varying durations at a high masker level.
  • Temporal integration was measured by analyzing masked thresholds and MR across different stimulus durations and masker phase curvatures.

Main Results:

  • Masking release (MR) increased with stimulus duration, indicating integration of target information across masker dips.
  • A physiology-inspired model predicted the duration dependence of MR, linking it to temporal envelope modulation strength.
  • The model's prediction of masked thresholds across masker phase curvatures did not align with human data, suggesting limitations in modeling human auditory phase response.

Conclusions:

  • Temporal integration across neural envelope features within masker dips contributes to masking release (MR) with SPHCs.
  • The findings support the role of dip listening in auditory masking release.
  • Further model refinement is needed to accurately capture human auditory processing, particularly phase response.