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Related Experiment Video

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Mechanisms of Spectrotemporal Modulation Detection for Normal- and Hearing-Impaired Listeners.

Emmanuel Ponsot1,2, Léo Varnet1, Nicolas Wallaert1

  • 1Laboratoire des systèmes perceptifs, Département d'études cognitives, École normale supérieure, Université PSL, CNRS, Paris, France.

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|February 23, 2021
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Summary

This study reveals how normal-hearing and hearing-impaired individuals detect spectrotemporal modulations (STMs) in noise. Hearing loss primarily broadens cochlear filters, impacting STM processing.

Keywords:
computational modelingpsychophysical reverse correlationsensorineural hearing lossspectrotemporal modulation processingsuprathreshold auditory processing

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Speech Processing

Background:

  • Spectrotemporal modulations (STMs) are crucial for speech intelligibility.
  • Understanding STM processing and the impact of cochlear hearing loss is limited.

Purpose of the Study:

  • To characterize STM detection mechanisms using a novel psychophysical framework.
  • To investigate how cochlear hearing loss affects STM processing at a behavioral level.

Main Methods:

  • Developed a psychophysical reverse correlation method in modulation space.
  • Derived perceptual filters for normal-hearing and hearing-impaired listeners detecting STMs in noise.
  • Utilized computational tools and a temporal modulation filter bank model.

Main Results:

  • Both groups exhibited a similar linear-nonlinear processing cascade for STM detection.
  • Hearing-impaired individuals showed broader cochlear filters, leading to modulation mistuning.
  • Individual differences in processing were observed beyond cochlear filter broadening.

Conclusions:

  • The findings support a temporal modulation filter bank model for STM processing.
  • Cochlear filter broadening is a key factor in hearing-impaired STM processing deficits.
  • Additional mechanisms contribute to interindividual variability in speech intelligibility.