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Modulation discrimination interference and auditory grouping.

B C Moore1, M J Shailer

  • 1Department of Experimental Psychology, University of Cambridge, U.K.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|June 29, 1992
PubMed
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Modulation discrimination interference (MDI) occurs when background sounds disrupt the detection of changes in target sound modulation. Perceptual grouping significantly impacts MDI, with asynchronous sounds reducing interference.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing in hearing

Background:

  • Modulation discrimination interference (MDI) impairs detecting changes in a target sound's modulation (AM or FM).
  • MDI is not explained by peripheral auditory system interactions.
  • MDI may stem from perceptual grouping of similarly modulated sounds.

Purpose of the Study:

  • Investigate the role of perceptual grouping in MDI.
  • Measure MDI for amplitude modulation (AM) depth changes.
  • Examine effects of duration and temporal asynchrony on MDI.

Main Methods:

  • Measured MDI for AM depth detection.
  • Varied overall duration and onset/offset asynchrony between target and masker sounds.
  • Subjects rated target modulation clarity in mixed sounds.

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Main Results:

  • MDI involves two factors: difficulty hearing target pitch and difficulty hearing target modulation.
  • Perceptual grouping strongly influences pitch perception difficulty.
  • Asynchronous gating reduces or eliminates pitch perception difficulty.

Conclusions:

  • MDI is influenced by both target pitch clarity and specific modulation perception.
  • Perceptual grouping affects MDI primarily through its impact on pitch perception.
  • Temporal segregation (asynchronous gating) can mitigate MDI effects related to pitch.