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Hearing impairment (HI) affects temporal envelope processing, but not all detection tasks reveal these changes. Specific tests show HI listeners represent across-frequency temporal coherence differently, impacting spectral-shape discrimination.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Hearing Science

Background:

  • Across-frequency temporal coherence is crucial for auditory perception.
  • Hearing impairment (HI) may alter the processing of temporal envelope information.
  • The impact of HI on temporal envelope representation requires further investigation.

Purpose of the Study:

  • To investigate how hearing impairment (HI) influences the representation of across-frequency temporal coherence.
  • To determine if detection tasks adequately capture HI-related distortions in temporal envelope processing.

Main Methods:

  • Two experiments were conducted comparing listeners with normal hearing and those with HI.
  • Experiment 1: Assessed detection of across-frequency differences in modulation phase.
  • Experiment 2: Evaluated spectral-shape discrimination with imposed modulation phase disparities.

Main Results:

  • Listeners with HI performed similarly to normal-hearing listeners in detecting across-frequency modulation phase differences.
  • Spectral-shape discrimination was impaired by phase disparities in normal-hearing listeners.
  • HI listeners showed less impairment in spectral-shape discrimination, indicating altered envelope phase representation.

Conclusions:

  • Hearing impairment alters the representation of auditory envelope phase.
  • Simple detection tasks may not reveal HI-related deficits in temporal processing.
  • Multiple psychophysical approaches are needed to fully understand the effects of hearing loss on auditory perception.