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Detecting temporal onset and offset asynchrony in multicomponent complexes

J Zera1, D M Green

  • 1Department of Psychology, University of Florida, Gainesville 32611.

The Journal of the Acoustical Society of America
|February 1, 1993
PubMed
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Listeners can detect temporal asynchrony in complex sounds, with onset detection being more sensitive than offset detection. This ability relies on frequency channel comparisons, not overall sound energy timing.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Listeners' ability to perceive temporal relationships between sound components is crucial for auditory scene analysis.
  • Multicomponent auditory complexes present challenges for temporal processing due to overlapping spectral and temporal information.

Purpose of the Study:

  • To measure the just-noticeable differences in temporal synchrony for onset and offset of components in multicomponent complexes.
  • To investigate the influence of various acoustic parameters on the detection of temporal asynchrony.
  • To determine whether temporal asynchrony detection relies on inter-channel comparisons or overall envelope changes.

Main Methods:

  • Listeners discriminated between synchronous and asynchronous multicomponent complexes.

Related Experiment Videos

  • Asynchrony was manipulated by altering the start (onset) or end (offset) times of harmonic or logarithmically spaced components.
  • Parameters varied included component rise/decay times, complex duration, and component frequency position.

    • Main Results:

    • Detection thresholds for onset asynchrony were generally lower than for offset asynchrony.
    • Onset thresholds showed a nonmonotonic relationship with rise time, with a minimum at 1 ms.
    • Offset thresholds increased monotonically with decay time.
    • Detection performance was influenced by the frequency region of the asynchronous component and stimulus complexity (harmonic vs. logarithmic spacing).
    • Forward and backward masking effects were minimal.

    Conclusions:

    • Temporal asynchrony detection in multicomponent complexes is primarily mediated by comparisons across different frequency channels.
    • Onset asynchrony is more readily detected than offset asynchrony, suggesting asymmetrical processing.
    • The findings have implications for understanding speech and music perception, where precise temporal coordination is vital.