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Related Experiment Videos

Modeling temporal asymmetry in the auditory system

R D Patterson1, T Irino

  • 1Physiology Department, University of Cambridge, United Kingdom.

The Journal of the Acoustical Society of America
|November 20, 1998
PubMed
Summary
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Human hearing is sensitive to temporal asymmetry in sound. This study finds that autocorrelation, used in some auditory models, reduces this asymmetry, challenging current pitch perception models and proposing a more robust integration method.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Environmental sound waves are typically asymmetric in time, a feature humans are highly sensitive to.
  • Existing cochlear models enhance temporal asymmetry, but it's insufficient to explain perceptual asymmetry.
  • The Auditory Image Model (AIM) explains perceptual asymmetry through enhanced temporal asymmetry in neural activity.

Purpose of the Study:

  • To investigate the effect of autocorrelation on temporal asymmetry in various auditory models.
  • To evaluate if autocorrelogram models can explain the observed perceptual asymmetry.
  • To develop a more robust and physiologically plausible strobed temporal integration method.

Main Methods:

  • Examined temporal asymmetry in auditory models with varied filterbanks, compression, and neural transduction.

Related Experiment Videos

  • Assessed the impact of autocorrelation on neural activity patterns.
  • Reviewed the original strobed temporal integration and proposed a new version based on delta-gamma theory.

    • Main Results:

    • Autocorrelation does not enhance temporal asymmetry and often diminishes it.
    • Autocorrelogram models, in their current form, fail to account for the magnitude of perceptual asymmetry.
    • A revised strobed temporal integration model demonstrates improved robustness and physiological plausibility.

    Conclusions:

    • Autocorrelation is not a suitable mechanism for explaining perceptual asymmetry in auditory processing.
    • Current autocorrelogram-based pitch models require significant revision.
    • The proposed delta-gamma-based strobed temporal integration offers a more viable explanation for auditory temporal asymmetry perception.