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Informational processing of complex sound. II. Cross-dimensional analysis.

R A Lutfi1

  • 1Department of Communicative Disorders, University of Wisconsin, Madison.

The Journal of the Acoustical Society of America
|May 1, 1990
PubMed
Summary

Listeners can process auditory information across multiple acoustic dimensions, with performance growing with the number of tones. This study reveals how the brain integrates frequency, intensity, and duration for sound perception.

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Information Processing

Background:

  • Listeners' capacity to process acoustic information across multiple dimensions is crucial for understanding complex auditory scenes.
  • Previous research has explored single-dimension processing, but simultaneous multi-dimensional integration remains less understood.

Purpose of the Study:

  • To investigate listeners' ability to simultaneously process information across different acoustic dimensions (frequency, intensity, duration).
  • To model how information content, rather than stimulus packaging, influences auditory perception.
  • To quantify transmitted information within and across acoustic dimensions.

Main Methods:

  • Listeners identified a target sequence among pairs of n-tone sequences (n=1-12) where frequency, intensity, and duration varied randomly.

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  • Performance (d') was measured against the number of tones (n) and compared to ideal observer models.
  • Analysis focused on growth rates of d' and the weighting of different acoustic parameters.

    • Main Results:

    • Listener performance (d') grew at a rate slightly less than the square root of n, approaching cube root of n growth when differences were in a single parameter.
    • Despite not reaching ideal observer levels, listeners consistently assigned optimal weights to tones and acoustic parameters.
    • Transmitted information was estimated at 0.9-2.0 bits per dimension and 2.1-3.0 bits across dimensions.

    Conclusions:

    • Auditory performance is primarily driven by the information content of sounds, irrespective of how it's presented across acoustic dimensions.
    • The brain effectively integrates information from frequency, intensity, and duration, demonstrating robust multi-dimensional auditory processing.
    • Findings support models where auditory perception relies on the overall information load rather than specific stimulus configurations.