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Related Experiment Videos

Failure to unlearn the precedence effect.

R Y Litovsky1, M L Hawley, B J Fligor

  • 1Hearing Research Center and Department of Biomedical Engineering, Boston University, Massachusetts 02215, USA. litovsky@bu.edu

The Journal of the Acoustical Society of America
|December 7, 2000
PubMed
Summary
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This study investigated the precedence effect in hearing. Results show that training does not improve the ability to discern the direction of a lagging sound, suggesting auditory suppression is robust.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Perception

Background:

  • The precedence effect demonstrates that listeners prioritize the leading sound's spatial cues over the lagging sound's.
  • This effect is attributed to an auditory process that suppresses directional information from the lagging sound.
  • Previous research suggested training could reduce this suppression.

Purpose of the Study:

  • To determine if common psychophysical procedures can train listeners to overcome the precedence effect's suppression of lagging sound information.
  • To investigate if listeners can "unlearn" the poorer discrimination of interaural time differences (ITD) for lagging sounds.

Main Methods:

  • Eight subjects underwent extensive training (9-31 hours) on a precedence task using blocked or adaptive procedures to vary ITD.

Related Experiment Videos

  • The study focused on measuring just-noticeable differences (jnd's) for lagging and single-source sounds.

    • Main Results:

    • No evidence of "unlearning" the precedence effect was observed.
    • Subjects consistently showed high jnd's for the lagging sound and low jnd's for the single source, even after training.
    • Discrimination of the lagging sound's ITD remained poor.

    Conclusions:

    • The auditory suppression of directional information from lagging sounds appears resistant to training with standard psychophysical methods.
    • Directional information from the lagging source may not be easily accessible for perceptual learning.
    • Discrepancies with prior findings highlight the need for further research into the mechanisms of the precedence effect and auditory learning.