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Amplitude modulation sensitivity as a mechanism increment detection.

Frederick J Gallun1, Ervin R Hafter

  • 1Department of Psychology, University of California, Berkeley, California 94720-1650, USA. gallun@bu.edu

The Journal of the Acoustical Society of America
|July 15, 2006
PubMed
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Listeners detect changes in sound intensity using mechanisms sensitive to amplitude modulation (AM). This AM masking effect persists even when the masker

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal detection theory

Background:

  • Temporal integration describes how sound detectability improves with duration.
  • This phenomenon is increasingly explained by statistical "multiple looks" processes.
  • Listeners may use intensity change sensitivity, potentially linked to amplitude modulation (AM), for continuous maskers.

Purpose of the Study:

  • To investigate the role of amplitude modulation (AM) sensitivity in detecting intensity increments.
  • To determine if AM masking occurs at distant carrier frequencies.

Main Methods:

  • Change detection of a tonal signal was measured.
  • Amplitude modulation (AM) maskers were presented at the same or distant carrier frequencies as the target signal.

Related Experiment Videos

  • Mechanisms were modeled as outputs of modulation filters sensitive to low (4-16 Hz) and high (~100 Hz) modulation rates.

    • Main Results:

    • Listeners' intensity increment detection was consistent with mechanisms sensitive to AM at both low and high modulation rates.
    • AM masking effects were observed even when the masker's carrier frequency was over two octaves above the signal's.
    • Results support the hypothesis that AM sensitivity underlies intensity increment detection.

    Conclusions:

    • Auditory intensity increment detection relies on mechanisms sensitive to envelope modulation.
    • These mechanisms are similar to those involved in across-frequency masking of AM signals.
    • The findings suggest a unified account for AM sensitivity and intensity change detection in hearing.