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Related Experiment Videos

Evidence that comodulation detection differences depend on within-channel mechanisms.

Stephen J Borrill1, Brian C J Moore

  • 1Department of Experimental Psychology, University of Cambridge, United Kingdom.

The Journal of the Acoustical Society of America
|February 9, 2002
PubMed
Summary

The comodulation detection difference (CDD) is higher when signal and masker envelopes are synchronized. This study suggests spread of excitation and dip listening, not perceptual grouping, explain this auditory masking phenomenon.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Masking occurs when a signal is made harder to hear by a masker.
  • Comodulation detection difference (CDD) is a phenomenon where masking is worse for synchronized envelopes.

Purpose of the Study:

  • To investigate the underlying mechanisms of CDD.
  • To differentiate between perceptual grouping and spread of excitation/dip listening hypotheses.

Main Methods:

  • Experiment 1: Varied frequency separation (Δf) between signal and masker bands with comodulated, uncorrelated, or sinusoidal envelopes.
  • Experiment 2: Fixed Δf and manipulated masker band correlation and level.

Main Results:

  • CDD occurred for Δf up to 1000 Hz, diminishing at 1400 Hz.

Related Experiment Videos

  • Masking magnitude correlated with comodulation of the most effective masker band.
  • Thresholds were similar for uncorrelated and sinusoidal masker conditions.

    • Conclusions:

    • Results support spread of excitation and dip listening as the primary causes of CDD.
    • Perceptual grouping is less likely to explain the observed CDD effects.