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Related Experiment Videos

Comodulation masking release: is comodulation sufficient?

J H Grose1, J W Hall

  • 1University of North Carolina, Division of Otolaryngology/Head & Neck Surgery, Chapel Hill 27599-7070.

The Journal of the Acoustical Society of America
|May 1, 1993
PubMed
Summary
This summary is machine-generated.

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Comodulation masking release (CMR) is linked to auditory grouping. Disrupting auditory object formation, especially with onset/offset asynchrony, significantly impacts CMR, suggesting these processes are interconnected.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Common amplitude modulation across frequencies aids comodulation masking release (CMR).
  • CMR is also potentially linked to auditory grouping, where sounds are perceived as a unified whole.

Purpose of the Study:

  • To investigate the association between CMR and auditory grouping.
  • To determine if auditory grouping is a prerequisite for CMR.

Main Methods:

  • Three experiments manipulated variables to disrupt the fusion of comodulated noise bands.
  • Experiment 1 varied onset/offset asynchrony between noise bands.
  • Experiment 2 used an auditory streaming paradigm; Experiment 3 attempted to separate noise bands into harmonic series.

Main Results:

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  • Complete abolition of CMR occurred with onset/offset asynchrony of 50 ms or greater.
  • Auditory streaming significantly disrupted CMR, though a substantial amount remained.
  • Separating noise bands into harmonic series had a minimal effect, not clearly due to perceptual parsing.

    • Conclusions:

    • CMR mechanisms are not independent of auditory object formation processes.
    • Onset/offset synchrony is a critical cue for the relationship between CMR and auditory grouping.