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Related Experiment Videos

Defining and measuring speech movement events.

Stephen M Tasko1, John R Westbury

  • 1Army Audiology and Speech Center, Walter Reed Army Medical Center, Washington, DC, USA. stephen.tasko@umich.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|January 30, 2004
PubMed
Summary
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Speech research often assumes discrete units, but movements are continuous. This study introduces a "stroke" method to segment speech movements, aiding in understanding speech motor behavior and organization.

Area of Science:

  • Speech Motor Control
  • Articulatory Phonetics
  • Biomechanics of Speech

Background:

  • Traditional speech research posits discrete units, conflicting with smooth, continuous speech movement waveforms.
  • Reliable identification of speech movement units is crucial for understanding speech motor behavior and organization.

Purpose of the Study:

  • To develop and validate a method for segmenting speech movements into discrete units called "strokes."
  • To analyze kinematic features of these speech movement strokes.
  • To investigate the relationship between speech strokes and acoustic events, specifically alveolar fricatives.

Main Methods:

  • Defined a "stroke" as the period between two successive local minima in an articulator point's speed history.
  • Segmented speech-related movements of tongue blade, tongue dorsum, lower lip, and jaw in healthy young speakers.

Related Experiment Videos

  • Analyzed kinematic features (peak speed, boundary speed, duration, distance) of identified strokes.

    • Main Results:

    • Articulator fleshpoints were distinguishable based on kinematic stroke features.
    • Tongue blade and jaw strokes overlapping with alveolar fricatives showed distinct kinematic profiles.
    • Acoustic timing of alveolar fricatives did not directly correlate with kinematic features of presumed production strokes.

    Conclusions:

    • The proposed "stroke" method offers a simple approach to segmenting and analyzing speech movements.
    • Kinematic analysis of speech strokes can differentiate articulatory movements and their relation to specific speech sounds.
    • Further research is needed to refine the understanding of the relationship between acoustic events and articulatory kinematics.