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Related Experiment Videos

Intensity discrimination for precedence effect stimuli

R L Freyman1, D D McCall, R K Clifton

  • 1Department of Communication Disorders, University of Massachusetts, Amherst 01003, USA.

The Journal of the Acoustical Society of America
|May 5, 1998
PubMed
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The precedence effect masks lagging sound intensity changes. However, perceived loudness, not just intensity, reveals listeners

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Acoustic signal processing

Background:

  • The precedence effect describes how the brain localizes sound based on the first arriving signal, suppressing subsequent echoes.
  • Previous research suggests the lagging sound is generally attenuated or suppressed within the precedence effect.
  • Understanding the precise mechanisms of auditory localization and echo suppression is crucial for auditory scene analysis.

Purpose of the Study:

  • To investigate normal-hearing listeners' sensitivity to intensity variations in the lagging sound within the precedence effect.
  • To determine if the precedence effect involves a general suppression of the lagging sound's intensity or specific cues.
  • To explore the relationship between physical intensity changes and perceived loudness of the lagging sound.

Related Experiment Videos

Main Methods:

  • Two identical 2-ms white noise bursts with a 2-ms onset delay were presented from loudspeakers positioned 45 degrees left and right of midline.
  • A two-alternative forced-choice (2AFC) procedure assessed discrimination of intensity changes in the lead, lag, or both stimuli.
  • Intensity differences were analyzed directly and after transformation into equivalent monaural levels using KEMAR measurements and binaural loudness summation.

Main Results:

  • Direct analysis showed the poorest discrimination for intensity changes in the lagging sound.
  • After accounting for binaural loudness summation, discrimination for the lagging sound intensity changes matched that of the leading sound.
  • Listeners demonstrated high sensitivity to the lag's presence, exceeding predictions based solely on loudness changes.

Conclusions:

  • The precedence effect does not involve a complete suppression or attenuation of the lagging sound's physical intensity.
  • Auditory localization cues, rather than overall loudness, appear to be the primary target of suppression within the precedence effect.
  • Sensitivity to the lagging sound is complex and influenced by factors beyond simple loudness perception, particularly directional cues.