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Between sound and perception: reviewing the search for a neural code.

J J Eggermont1

  • 1Neuroscience Research Group, Department of Physiology, University of Calgary, 2500 University Drive N.W., Calgary, AB, Canada T2N 1N4. eggermon@ucalgary.ca

Hearing Research
|July 27, 2001
PubMed
Summary

This review explores how the brain processes sound, distinguishing between sound texture and contours. It proposes a multiplexed coding model where neural ensembles represent complex sound features.

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Area of Science:

  • Auditory Neuroscience
  • Computational Auditory Neuroscience

Background:

  • The auditory system processes sound through a hierarchical sequence of representation, transformation, and coding.
  • Understanding how speech sounds are encoded along the auditory pathway is crucial for auditory perception.

Purpose of the Study:

  • To review the neural representation of sound features, including texture and contours.
  • To investigate the roles of representation, transformation, and coding in auditory perception.
  • To propose a model for multiplexed coding of complex sounds in the auditory cortex.

Main Methods:

  • Review of existing literature on auditory processing and neural representations.
  • Analysis of evidence for place and temporal/synchrony representations of sound features.

Related Experiment Videos

  • Examination of neuronal activity patterns in the auditory pathway and cortex.

    • Main Results:

    • Sound texture features (frequency, pitch, harmonicity) are represented by place coding.
    • Sound contour features (onsets, offsets, modulations) are represented by temporal and synchrony coding.
    • Auditory cortex shows sensitivity to dynamic sound aspects (contours) that modulate neuronal activity activated by texture.

    Conclusions:

    • A hierarchical process of sound representation, transformation, and coding underlies auditory perception.
    • Complex sounds are encoded through a multiplexed system where contours modulate neuronal ensembles sensitive to texture.
    • This model explains how widespread synchrony across auditory cortical areas contributes to complex sound perception.