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Related Experiment Videos

Intensity discrimination under backward masking.

C J Plack1, N F Viemeister

  • 1Department of Psychology, University of Minnesota, Minneapolis 55455.

The Journal of the Acoustical Society of America
|December 1, 1992
PubMed
Summary
This summary is machine-generated.

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Backward masking significantly elevated auditory intensity discrimination thresholds, suggesting central processing. Forward masking also elevated thresholds, but to a lesser extent, with simultaneous notched noise reducing these effects.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Auditory neuroscience

Background:

  • Intensity discrimination is crucial for auditory perception.
  • Masking effects, both forward and backward, can impair auditory processing.
  • Previous research indicated forward masking elevations in the Weber fraction.

Purpose of the Study:

  • To investigate the effects of forward and backward masking on auditory intensity discrimination.
  • To explore the role of central auditory processes in masking phenomena.
  • To determine if simultaneous notched noise affects masking-induced elevations in the Weber fraction.

Main Methods:

  • Measuring the Weber fraction for a sinusoidal pedestal under forward and backward masking conditions.
  • Utilizing an intense narrow-band noise as a masker.

Related Experiment Videos

  • Presenting a notched noise simultaneously with the pedestal in some conditions.

    • Main Results:

    • Forward masking elevated the Weber fraction at medium pedestal levels, consistent with prior findings.
    • Backward masking caused a substantially larger elevation in the Weber fraction compared to forward masking.
    • Simultaneous presentation of a notched noise reduced the magnitude of midlevel elevation in both masking conditions.

    Conclusions:

    • Large masking effects on intensity discrimination can occur without direct masker influence on the auditory nerve.
    • Central auditory processes likely contribute to masking effects observed in intensity discrimination.
    • The mechanisms underlying forward and backward masking may differ despite observed similarities in results.