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Related Experiment Videos

Stimulus-driven, time-varying weights for comodulation masking release

S Buus1, L Zhang, M Florentine

  • 1Department of Electrical and Computer Engineering (409 DA), Northeastern University Boston, Massachusetts 02115, USA.

The Journal of the Acoustical Society of America
|April 1, 1996
PubMed
Summary
This summary is machine-generated.

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Comodulation masking release (CMR) is achieved by "listening in the valleys" of masker noise. This study confirms this mechanism, showing how auditory systems adjust weighting based on masker envelope correlations.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing in hearing

Background:

  • Comodulation masking release (CMR) is a phenomenon where auditory masking is reduced when masker envelopes are correlated.
  • The
  • listening in the valleys
  • hypothesis suggests listeners utilize brief moments of low masker intensity to detect signals.

Purpose of the Study:

  • To empirically test the
  • listening in the valleys
  • hypothesis as the mechanism underlying comodulation masking release (CMR).
  • To investigate the role of masker envelope correlation in CMR.

Main Methods:

  • Listeners detected 1-kHz tone pulses in single-band or multi-band noise maskers with correlated or uncorrelated envelopes.

Related Experiment Videos

  • Signal pulse levels varied randomly around masked threshold.
  • Conditional psychometric functions were constructed to analyze listener responses based on short-term masker levels.

    • Main Results:

    • Psychometric function slopes decreased with increasing masker level for correlated multiband maskers, indicating reduced weighting of the signal channel at higher masker levels.
    • Slopes remained constant for single-band and uncorrelated multiband maskers.
    • Findings support the
    • listening in the valleys
    • hypothesis by demonstrating adaptive weighting of auditory information.

    Conclusions:

    • The study provides direct evidence that comodulation masking release (CMR) is mediated by
    • listening in the valleys
    • mechanism.
    • Auditory system weighting adapts to masker envelope statistics, particularly for correlated maskers.
    • Envelope comparison models may explain CMR if incorporating pre-comparison compressive nonlinearity.