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Listeners attune to dynamic speech cues, not static ones, for compensation for coarticulation. This research clarifies how the auditory system processes speech sounds for better understanding.

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Area of Science:

  • Speech perception
  • Auditory processing
  • Psychoacoustics

Background:

  • Perception of speech segments is influenced by surrounding sounds, a phenomenon known as compensation for coarticulation.
  • Two main theories exist: one posits low-level auditory contrast effects from static signal properties, while the other suggests dynamic attunement to acoustic effects of gestural overlap.

Purpose of the Study:

  • To investigate whether static signal properties or dynamic formant relationships in speech precursors drive perceptual shifts in compensation for coarticulation.
  • To differentiate between auditory contrast and gestural attunement accounts of coarticulation.

Main Methods:

  • Utilized sinewave speech precursors in two experiments to manipulate acoustic properties.
  • Experiment 1 confirmed that sinewave precursors induce perceptual shifts.
  • Experiment 2 temporally reversed F1 and F2 in precursors, preserving static F3 but disrupting dynamic formant relationships.

Main Results:

  • Sinewave speech precursors significantly shifted perception of following speech segments.
  • Temporally reversing F1 and F2 in precursors, while maintaining static F3, resulted in significantly smaller perceptual shifts.
  • These effects were limited to a narrow portion of the speech continuum.

Conclusions:

  • Dynamic formant relationships, not static signal properties like F3 frequency, provide the crucial information for compensation for coarticulation.
  • Findings support the theory that listeners attune to dynamic gestural information for speech perception.