发现说话动作中普遍存在极限环结构，揭示了发音的内在节奏性。
Limit cycles for speech
- 用极限环模型重新表征离散发音动作，突破传统观点
- 在发音运动中恢复出此前无法观测的周期性结构
- 适合研究语音产生机制与神经动力学的学者
人类言语的声学能量波动和皮层振荡中的神经兴奋具有节律特征，但生成言语的发音动作是否也具备相应节律性尚不明确。传统观点将发音视为离散、目标导向的动作，难以解释节律性现象。本文表明，一种看似反直觉但同样严谨的离散动作表征方式，揭示了发音活动中普遍存在的极限环组织，并恢复出以往无法观测的运动节律结构。这一发现解决了生物节律性与言语离散性长期存在的矛盾，表明在个体发音动作的基本层面就存在节律组织，为理解言语这一核心人类高级功能提供了新视角。
原文摘要 · Abstract (English)
Rhythmic fluctuations in acoustic energy and accompanying neuronal excitations in cortical oscillations are characteristic of human speech, yet whether a corresponding rhythmicity inheres in the articulatory movements that generate speech remains unclear. The received understanding of speech movements as discrete, goal-oriented actions struggles to make contact with the rhythmicity findings. In this work, we demonstrate that an unintuitive -- but no less principled than the conventional -- representation for discrete movements reveals a pervasive limit cycle organization and unlocks the recovery of previously inaccessible rhythmic structure underlying the motor activity of speech. These results help resolve a time-honored tension between the ubiquity of biological rhythmicity and discreteness in speech, the quintessential human higher function, by revealing a rhythmic organization at the most fundamental level of individual articulatory actions.
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