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Volume 47, Issue 2
  • ISSN 1810-7478
  • E-ISSN: 2589-5230
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Abstract

Abstract

Speech production requires temporal coordination between the actions of different functional groupings of muscles in the human body. Crucially, such functionally organized units, or “modules”, may be susceptible to disruption by an external stimulus such as a startling auditory stimulus (SAS; >120dB), enabling a possible window into the internal structure of learned speech movements. Following on the observation that SAS is known to accelerate the release of pre-planned actions, the current study examines lip kinematics in SAS-induced responses during speech movements to test whether this accelerated release applies on the scale of entire syllables or on the scale of smaller functional units. Production measures show that SAS-elicited bilabial movements in [ba] syllables are prone to disruption as measured by discontinuity in velocity profiles. We use a 3D finite element method (FEM) biomechanical model to simulate the temporal interaction between muscle groupings in speech. Simulation results indicate that this discontinuity can be accounted for as an instance of temporally decoupled coordination across neuromuscular modules. In such instances, the muscle groupings controlling lip compression and jaw opening, which normally fire sequentially, appear more likely to be activated synchronously.

© Department of English, National Taiwan Normal University
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/content/journals/10.1075/consl.00026.chi
2021-11-17
2024-04-19

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Auditory startle disrupts speech coordination
Concentric 47, 167 (2021); https://doi.org/10.1075/consl.00026.chi
/content/journals/10.1075/consl.00026.chi
/content/journals/10.1075/consl.00026.chi
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  • Article Type: Research Article
Keyword(s): ArtiSynth; ArtiSynth 模型; speech coordination; speech modules; startle; temporal decoupling; 時序解耦; 言語協同運動; 言語模組; 驚嚇刺激

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