语言中舌头运动的自由度可能受到生物力学的限制
Degrees of freedom of tongue movements in speech may be constrained by biomechanics
摘要：
对不同语言进行的许多研究发现，言语中的舌头运动是沿着两个主要自由度（dfs）进行的：从前高到后低轴和从前高到前低轴。我们探讨的假设，这两个主要的d.f.s可以找到他们的起源在声道的物理特性。一个大的舌头形状的生物力学舌头模型，使用蒙特卡罗方法，以彻底采样的肌肉控制空间生成。用PCA分析得到的形状。前两个因素解释了84%的方差，它们与实验观察到的两个d.f.s.相似。这一发现表明，d.f.s.并不是特定于语言的，语言利用了基于生物力学的舌头特性来形成不同的声音。
英文摘要：
A number of studies carried out on different languages have found that tongue movements in speech are made along two primary degrees of freedom (d.f.s): the high-front to low-back axis and the high-back to low-front axis. We explore the hypothesis that these two main d.f.s could find their origins in the physical properties of the vocal tract. A large set of tongue shapes was generated with a biomechanical tongue model using a Monte-Carlo method to thoroughly sample the muscle control space. The resulting shapes were analyzed with PCA. The first two factors explain 84% of the variance, and they are similar to the two experimentally observed d.f.s. This finding suggests that the d.f.s. are not speech-specific, and that speech takes advantage of biomechanically based tongue properties to form different sounds.
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