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Effects of modulator phase for comodulation masking release and modulation detection interference

V M Richards1, E Buss, L Tian

  • 1Department of Psychology, University of Pennsylvania, Philadelphia 19104, USA.

The Journal of the Acoustical Society of America
|July 1, 1997
PubMed
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This study investigated auditory perception, finding that across-frequency comparisons of envelope patterns are crucial for comodulation masking release (CMR) and modulation detection interference (MDI) tasks. Results show phase effects are limited to smaller frequency separations.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Comodulation masking release (CMR) and modulation detection interference (MDI) are key phenomena in auditory masking.
  • Understanding across-frequency comparisons of envelope patterns is vital for explaining auditory masking release.

Purpose of the Study:

  • To evaluate the role of across-frequency envelope pattern comparisons in CMR.
  • To compare the effects of target-masker frequency separation on both CMR and MDI tasks.
  • To investigate modulation-rate specific adaptation in auditory perception.

Main Methods:

  • Measured detection thresholds for sinusoidal amplitude modulation (SAM) detection, modulation depth reduction, and tone detection in noise.
  • Utilized target-alone and target-with-two-maskers conditions.

Related Experiment Videos

  • Assessed thresholds after prolonged exposure to a modulated masker to study adaptation.

    • Main Results:

    • SAM detection thresholds were independent of masker modulation pattern similarity.
    • Modulator phase effects were observed for target-masker frequency separations within 1-2 octaves for MDI tasks.
    • Modulation-rate specific adaptation occurred for frequency separations up to 2 octaves.

    Conclusions:

    • Across-frequency comparisons of envelope patterns are important for CMR and MDI, particularly at smaller frequency separations.
    • Auditory system exhibits frequency-specific adaptation to amplitude modulation.
    • Findings contribute to understanding the mechanisms of auditory masking and perception.