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Related Experiment Videos

A population study of the precedence effect.

Kourosh Saberi1, Joseph V Antonio, Agavni Petrosyan

  • 1Department of Cognitive Sciences, University of California, Irvine, CA 92697, USA. kourosh@uci.edu

Hearing Research
|April 28, 2004
PubMed
Summary

This study investigated auditory perception, finding that interaural level-difference (ILD) thresholds were higher in lag-click conditions than single-click conditions. Intensity did not affect ILD thresholds, unlike previous interaural time-difference (ITD) findings.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Perception

Background:

  • The precedence effect in auditory perception describes how listeners perceive the location of a sound based on the first arriving signal, even with later, spatially distinct echoes.
  • Previous research has explored the influence of stimulus intensity on auditory localization cues like interaural time differences (ITDs) and interaural level differences (ILDs) under various listening conditions.

Purpose of the Study:

  • To examine the effect of stimulus intensity on interaural level-difference (ILD) discrimination thresholds in untrained individuals under lag-click and single-click conditions.
  • To compare ILD discrimination performance with previously reported findings for interaural time-difference (ITD) discrimination under similar auditory precedence paradigms.

Main Methods:

  • Ninety-one untrained observers participated in a two-interval forced-choice task, discriminating ILD cues.

Related Experiment Videos

  • Participants completed trials under both lag-click and single-click conditions with 125-microsecond rectangular pulses and a 2 ms interclick interval.
  • Stimulus intensity was varied across three groups (43, 58, or 73 dB), and data from over 300 observers across studies were analyzed for response patterns and demographic effects.

    • Main Results:

    • Mean ILD thresholds were significantly higher in the lag-click condition ( > 15 dB) compared to the single-click condition ( > 6 dB), indicating reduced discrimination ability with auditory lag.
    • Unlike ITD discrimination, stimulus intensity did not significantly affect ILD discrimination thresholds in the lag-click condition.
    • Analysis of a large dataset revealed a spatial asymmetry in response patterns and a small, statistically significant effect of gender on performance.

    Conclusions:

    • Auditory ILD discrimination is impaired under lag-click conditions, with performance less sensitive to stimulus intensity compared to ITD discrimination.
    • A proposed model suggests that the decay of sensory memory and intensity-dependent changes in auditory filter bandwidths may explain the differing effects of intensity on ILD and ITD thresholds.