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Forward-masked intensity discrimination: duration effects and spectral effects

R S Schlauch1, N Lanthier, J Neve

  • 1University of Minnesota, Minneapolis 55455, USA. Schla001@maroon.tc.umn.edu

The Journal of the Acoustical Society of America
|July 1, 1997
PubMed
Summary

Masker duration and spectrum impact forward-masked intensity discrimination. Shorter maskers caused more masking, suggesting perceptual similarity influences auditory perception beyond simple sensory adaptation.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Sensory Perception

Background:

  • Forward-masked intensity discrimination is crucial for understanding auditory processing.
  • Masker characteristics, such as duration and spectrum, can significantly influence auditory perception.

Purpose of the Study:

  • To investigate the effects of masker duration and spectrum on forward-masked intensity discrimination.
  • To determine if masker characteristics influence auditory perception beyond peripheral sensory adaptation.

Main Methods:

  • Three experiments utilized adaptive forced-choice procedures to measure intensity discrimination in quiet and with forward maskers.
  • Varying masker durations (10 ms to 250 ms) and spectra (tonal and broadband noise) were employed.
  • Listeners' ability to discriminate sound intensity was assessed under different masking conditions.

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Main Results:

  • Shorter masker durations consistently produced more masking than longer durations, regardless of masker spectrum.
  • A mid-level elevation of the Weber fraction was observed across most conditions.
  • Results were inconsistent with purely peripheral sensory adaptation models.

Conclusions:

  • Perceptual similarity appears to play a role in forward-masked intensity discrimination.
  • The observed mid-level elevation of the Weber fraction is not fully explained by perceptual similarity alone.
  • Findings suggest complex interactions between masker properties and auditory perception.