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Related Experiment Videos

The synergy between speech production and perception.

Powen Ru1, Taishih Chi, Shihab Shamma

  • 1Center for Auditory and Acoustics Research, Institute for Systems Research, Electrical and Computer Engineering Department, University of Maryland, College Park, Maryland 20742, USA.

The Journal of the Acoustical Society of America
|February 1, 2003
PubMed
Summary

Speech intelligibility remains robust despite spectral changes, thanks to a synergy between vocal production and auditory perception. This resilience is key to understanding how we perceive sounds, including speech.

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Area of Science:

  • Acoustic Phonetics
  • Auditory Neuroscience
  • Speech Perception

Background:

  • Speech intelligibility is resilient to spectral deformations like translations, dilations, and shearing.
  • These spectral variations are linked to natural differences in vocal tract anatomy and acoustics.

Purpose of the Study:

  • To investigate the synergy between vocal production and auditory perception in maintaining speech intelligibility.
  • To analyze how vocal tract variations produce spectral distortions and how auditory cortex represents them.

Main Methods:

  • Developed a simplified sinusoidal model of the vocal tract to link articulatory parameters to spectral peaks.
  • Evaluated the production model using synthesized vowels compared to the TIMIT corpus.
  • Utilized a multiscale model of auditory processing to study spectral deformation effects in the auditory cortex.

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Main Results:

  • Spectral distortions (translations, dilations, shearing) are linked to variations in vocal tract length, profile, and losses.
  • Auditory cortical representations remain largely invariant to these spectral changes, except for axis translations.
  • The findings support a production-perception synergy explaining speech intelligibility robustness.

Conclusions:

  • The robustness of speech intelligibility stems from a coordinated interplay between vocal tract acoustics and auditory processing.
  • This synergy allows for stable perception of speech despite natural variations in vocal tract shape and size.
  • The principles may extend to the perception of other sound sources beyond speech.