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Related Experiment Video

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Ultrasound Images of the Tongue: A Tutorial for Assessment and Remediation of Speech Sound Errors
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Simultaneous tracking of coevolving distributional regularities in speech.

Xujin Zhang1, Lori L Holt1

  • 1Department of Psychology, Carnegie Mellon University.

Journal of Experimental Psychology. Human Perception and Performance
|October 2, 2018
PubMed
Summary

Adult listeners can track multiple, simultaneous speech regularities, adjusting phonetic perception. This demonstrates rapid, context-dependent adaptation in speech processing, not just simple instance accumulation.

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Area of Science:

  • Cognitive Science
  • Auditory Perception
  • Speech Processing

Background:

  • Speech perception relies on mapping acoustic input to language regularities.
  • Perceptual mappings are flexible, adapting to short-term speech input variations like accents.
  • It remains unclear if the brain tracks simultaneous regularities or a global one.

Purpose of the Study:

  • Investigate if the auditory system tracks simultaneous short-term distributional statistics in speech.
  • Determine if a global regularity dominates over distinct, coevolving distributions.
  • Examine the role of contextual cues in tracking multiple regularities.

Main Methods:

  • Three experiments were conducted with adult listeners.
  • Listeners were presented with speech input containing simultaneous, evolving distributional regularities.
  • Voice quality and visual cues were manipulated to indicate talker information for 'binning' acoustic instances.

Main Results:

  • Adult listeners successfully tracked distinct, simultaneously evolving regularities over time.
  • Tracking occurred even with opposing regularities and identical acoustic speech tokens.
  • Both voice quality and visual cues supported the tracking of coevolving distributional regularities.

Conclusions:

  • The auditory system can track multiple context-sensitive regularities simultaneously.
  • Speech perception involves rapid, context-dependent adaptive adjustments in mapping acoustic input to phonetic categories.
  • Perceptual reweighting is not solely based on accumulating acoustic instances but involves sophisticated tracking of distributional statistics.