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Related Experiment Videos

Temporal factors in referential intensity coding

C J Plack1

  • 1Laboratory of Experimental Psychology, University of Sussex, Brighton, England.

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

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Adding a brief tone burst near a target sound can improve intensity discrimination under backward masking. This "proximal" tone

Area of Science:

  • Psychoacoustics
  • Auditory perception
  • Signal processing

Background:

  • Backward masking is a phenomenon where a sound presented shortly after a target sound can impair the perception of the target.
  • Previous research suggests intensity discrimination under backward masking can be influenced by additional auditory stimuli.

Purpose of the Study:

  • To investigate how a "proximal" tone burst, presented before or after a target pedestal, affects intensity discrimination under backward masking.
  • To explore the role of stimulus level and temporal separation of the proximal tone burst on discrimination performance.
  • To model the underlying mechanisms of improved intensity discrimination.

Main Methods:

  • Three experiments were conducted using 30-ms, 1-kHz sinusoidal tone bursts.

Related Experiment Videos

  • Intensity discrimination was measured for a pedestal tone burst presented before a masker.
  • A proximal tone burst was varied in level and temporal proximity to the pedestal.

    • Main Results:

    • A proximal tone burst presented before the pedestal improved intensity discrimination when it was at a higher level than the pedestal.
    • The effectiveness of the proximal tone burst increased with the temporal gap.
    • Listeners employed distinct strategies based on the relative levels of the pedestal and proximal tone bursts.

    Conclusions:

    • The presence and level of a proximal tone burst can significantly enhance intensity discrimination, even under backward masking conditions.
    • Listeners utilize relative temporal and intensity cues, rather than absolute intensity, for improved discrimination.
    • A model based on temporal excitation patterns and "bumps" can explain the observed improvements in intensity discrimination.