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The effect of envelope modulations on binaural processing.

Matthew J Goupell1, Stephen Fong1, Olga Stakhovskaya1

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|June 3, 2019
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Envelope modulations slightly impaired binaural processing in normal-hearing listeners, especially at certain rates. This suggests potential for assessing hearing impairment by analyzing interaural envelope decorrelation in modulated sounds.

Keywords:
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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Binaural processing relies on interaural cues, including envelope information.
  • Amplitude modulations can influence the perception of these interaural cues.
  • Understanding these effects is crucial for diagnosing and addressing hearing deficits.

Purpose of the Study:

  • To investigate the impact of envelope modulations on binaural detection in bandlimited pulse trains.
  • To determine if interaurally correlated or uncorrelated modulations affect performance differently.
  • To explore the potential of this paradigm for assessing hearing-impaired populations.

Main Methods:

  • 10 young normal-hearing listeners detected an interaurally out-of-phase pulse train.
  • Stimuli included constant amplitude pulses (F), interaurally correlated modulations (CM), and uncorrelated modulations (UM).
  • Pulse rate (50-500 pps) and center frequency (4 or 8 kHz) were varied.

Main Results:

  • A small decrease in performance from F to CM, and a further decrease from CM to UM was observed.
  • A significant interaction between envelope modulation and pulse rate was found.
  • Performance differences were attributed to individual listener-based interaural envelope decorrelation.

Conclusions:

  • Most young normal-hearing listeners exhibit consistent encoding of modulated stimuli across ears.
  • Envelope modulations can subtly impact binaural processing, with effects varying by modulation type and rate.
  • This task shows promise for evaluating interaural decorrelation in hearing-impaired individuals, potentially explaining spatial hearing limitations.