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Related Experiment Videos

Profile analysis with an asynchronous target: evidence for auditory grouping

N I Hill1, P J Bailey

  • 1Department of Psychology, University of York, United Kingdom. nihl@york.ac.uk

The Journal of the Acoustical Society of America
|July 1, 1997
PubMed
Summary

Onset asynchrony significantly impairs across-frequency intensity comparisons in hearing. Introducing "captor" tones partially mitigated this effect, suggesting auditory grouping principles underlie the impairment.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Human Perception

Background:

  • Listeners' ability to compare sound intensity across frequencies is crucial for auditory perception.
  • Previous research indicated that differing start times (onset asynchrony) between sound components severely disrupt these comparisons.

Purpose of the Study:

  • To replicate the detrimental effect of onset asynchrony on across-frequency intensity discrimination.
  • To investigate whether "captor" tones could influence perceptual organization and mitigate the negative impact of asynchrony.

Main Methods:

  • Listeners performed simultaneous across-frequency intensity comparisons under conditions of synchronous onset and onset asynchrony (320 ms).
  • A novel condition introduced "captor" tones to the leading portion of the asynchronous target component.

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  • Thresholds for correct intensity comparison were measured in decibels (dB) for all conditions.

    • Main Results:

    • Onset asynchrony significantly increased intensity comparison thresholds by 6–16 dB compared to synchronous onset.
    • The presence of "captor" tones reduced the threshold elevation to a mean of 3 dB, though thresholds remained elevated.
    • All listeners showed higher thresholds with asynchrony, even with captor tones, compared to synchronous onset.

    Conclusions:

    • Onset asynchrony demonstrably impairs auditory profile analysis, supporting previous findings.
    • Auditory grouping principles appear to be the primary mechanism underlying the negative effects of onset asynchrony.
    • Captor tones offer partial relief by potentially altering perceptual organization, but do not fully restore performance.