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The precedence effect with increased lag level.

M Torben Pastore1, Jonas Braasch1

  • 1Center for Cognition, Communication and Culture, School of Architecture, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.

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|November 2, 2015
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Summary
This summary is machine-generated.

The precedence effect explains how the first sound dominates fused auditory images. Increasing the intensity of a delayed sound shifts perceived location and increases response variability, revealing individual differences in auditory cue weighting.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Binaural hearing

Background:

  • The precedence effect describes the dominance of the first sound in fused auditory images.
  • Understanding its limits is crucial for explaining complex sound localization.

Purpose of the Study:

  • To investigate the influence of lag intensity and inter-stimulus interval (ISI) on the precedence effect.
  • To explore individual listener variability in response to auditory stimuli.

Main Methods:

  • Presented 200-ms noise stimuli with varying lead-lag intensity differences (0-10 dB) and ISIs (0-5 ms) over headphones.
  • Recorded listener lateralization judgments and response variability.
  • Analyzed binaural cues, specifically interaural level differences (ILDs), in relation to perceived location.

Main Results:

  • Perceived lateralization shifted towards the lag sound as its intensity increased.
  • Response variability increased with higher lag levels.
  • Oscillatory patterns emerged across ISIs, correlating with ILDs, with significant listener-dependent variations.

Conclusions:

  • Listener weighting of onset versus ongoing auditory cues influences perceived location under the precedence effect.
  • Physical interference between lead and lag sounds, particularly ILDs in specific frequency bands, impacts auditory perception.
  • Individual differences in cue weighting contribute to variability in auditory localization phenomena.