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The nonlinear dynamics of speech categorization

B Tuller1, P Case, M Ding

  • 1Center for Complex Systems, Florida Atlantic University, Boca Raton 33431-0091.

Journal of Experimental Psychology. Human Perception and Performance
|February 1, 1994
PubMed
Summary
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This study reveals how silent gap duration impacts speech perception, showing dynamic effects like hysteresis. Increased repetitions near the boundary enhance categorical switching, suggesting a dynamical model for temporal context in speech.

Area of Science:

  • Psycholinguistics
  • Auditory Perception
  • Speech Science

Background:

  • The nonlinear relationship between acoustic cues and speech perception is not well understood.
  • Temporal context significantly influences how sounds are categorized.

Purpose of the Study:

  • To investigate the effects of varying silent gap duration on speech category judgments.
  • To develop and test a dynamical model explaining temporal context effects in speech perception.

Main Methods:

  • Experiment 1: Systematic variation of silent gap duration between /s/ and /aɪ/ stimuli to assess category boundary shifts.
  • Experiment 2: Evaluating model predictions by manipulating stimulus repetition frequency near the category boundary.

Main Results:

Related Experiment Videos

  • Silent gap duration systematically shifted the speech category boundary, exhibiting hysteresis, contrast, and critical boundary effects.
  • Increased stimulus repetitions near the boundary amplified the frequency of category judgments, supporting the dynamical model's predictions.

Conclusions:

  • A dynamical systems approach provides a framework for understanding how temporal context influences speech categorization.
  • The findings highlight the importance of dynamic processes in speech perception, moving beyond static acoustic feature analysis.