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Can monaural temporal masking explain the ongoing precedence effect?

Richard L Freyman1, Charlotte Morse-Fortier1, Amanda M Griffin1

  • 1Department of Communication Disorders, University of Massachusetts, 358 North Pleasant Street, Amherst, Massachusetts 01003, USA rlf@comdis.umass.edu, Charlotte_Morse-Fortier@AtriusHealth.org, Amanda.griffin@childrens.harvard.edu.

The Journal of the Acoustical Society of America
|March 3, 2018
PubMed
Summary
This summary is machine-generated.

The precedence effect in hearing differs for brief versus continuous sounds. Monaural masking data suggest that asymmetric audibility explains brief sounds but not continuous sounds, indicating distinct auditory processing mechanisms.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Sensory Processing

Background:

  • The precedence effect, crucial for sound localization, is traditionally explained by monaural processes like asymmetric temporal masking for transient sounds.
  • This study investigates whether monaural mechanisms also underlie the precedence effect for ongoing, continuous sounds.

Purpose of the Study:

  • To determine if monaural masking asymmetry explains the precedence effect for ongoing sounds.
  • To compare the auditory processing of transient versus ongoing sounds regarding the precedence effect.

Main Methods:

  • Presented participants with transient (single lead-lag noise bursts) and ongoing (trains of noise bursts) stimuli.
  • Measured monaural temporal masking patterns for both stimulus types.
  • Conducted supplementary measurements of interaural time discrimination.

Main Results:

  • Monaural masking data for ongoing sounds did not show a lead advantage, contradicting asymmetric audibility as an explanation.
  • Results for ongoing sounds were inconsistent with monaural explanations.
  • Interaural time discrimination measurements provided further insights into auditory processing differences.

Conclusions:

  • Asymmetric audibility is unlikely to explain the precedence effect for ongoing sounds.
  • The mechanisms underlying the precedence effect differ between transient and ongoing auditory stimuli.
  • This suggests distinct neural pathways or processing strategies for different sound durations.