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Tonal cues to prosodic structure in rate-dependent speech perception.

Jeremy Steffman1, Sun-Ah Jun2

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Listeners integrate pitch and duration cues to perceive speech rate, influencing how they interpret sound durations. This integration primarily occurs implicitly, not in explicit judgments.

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Area of Science:

  • Psycholinguistics
  • Speech Perception
  • Phonetics

Background:

  • Listeners use prosodic cues like pitch and duration to interpret speech.
  • Understanding how these cues interact to influence speech rate perception is crucial.

Purpose of the Study:

  • To investigate the integration of tonal and durational cues in speech rate perception.
  • To determine how this integration affects the interpretation of durational cues, specifically vowel duration.

Main Methods:

  • Three experiments manipulated pitch and duration of pre-target speech segments.
  • Listeners categorized vowel duration along a continuum, with manipulations affecting coda stop voicing perception.
  • Explicit duration and rate judgment tasks were also employed.

Main Results:

  • Tonal cues on lengthened syllables signaled a speech rate slowdown, shifting vowel duration perception.
  • Effects of pitch and duration were additive in a 2x2 design for categorization.
  • Explicit rate judgments relied solely on duration, not pitch, indicating limited cue integration.

Conclusions:

  • Integration of tonal and durational prosodic cues for speech rate perception is largely implicit.
  • Explicit rate judgments show less integration, relying primarily on durational information.
  • This highlights the complex interplay of prosodic cues in speech processing.