Estimating feedforward vs. feedback control of speech production through kinematic analyses of unperturbed articulatory movements.
Estimating feedforward vs. feedback control of speech production through kinematic analyses of unperturbed articulatory movements.
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DOI：
10.3389/fnhum.2014.00911
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发表时间：
2014
影响因子：
2.9
通讯作者：
Max L
中科院分区：
文献类型：
--
作者：
Kim KS;Max L
为了估计前馈与反馈控制系统在语音清晰度中的贡献，我们分析了辅音-元音（CV）和元音-辅音（VC）音节的未受干扰的舌头和下颌运动的初始和最终运动学之间的对应关系。如果运动范围和终点可以从早期的运动学信息高度预测，那么运动很可能是在没有大量在线校正的情况下完成的（前馈控制）;如果早期运动学和最终幅度或位置之间的对应性很低，在线调整可能改变了计划的轨迹（反馈控制）（Messier和Kalaska）。五个成年扬声器产生CV和VC音节高，中，或低元音，而运动的舌头和下巴电磁跟踪。检查了运动学参数峰值加速度或峰值速度与运动程度之间的对应关系，以及这些运动学标志处的关节空间坐标与运动终点之间的对应关系，以用于跨不同目标距离的运动（即，跨元音高度）和在目标距离内（即，在元音高度内）。两者合计，结果表明，这些CV和VC音节的下巴和舌头的运动主要是前馈控制，但与反馈为基础的贡献。一种类型的反馈驱动的补偿调节似乎是基于峰值加速度的变化来调节运动持续时间。从一个统计模型的基础上多元回归的结果，以说明如何估计这些反馈贡献的相对强度。
To estimate the contributions of feedforward vs. feedback control systems in speech articulation, we analyzed the correspondence between initial and final kinematics in unperturbed tongue and jaw movements for consonant-vowel (CV) and vowel-consonant (VC) syllables. If movement extents and endpoints are highly predictable from early kinematic information, then the movements were most likely completed without substantial online corrections (feedforward control); if the correspondence between early kinematics and final amplitude or position is low, online adjustments may have altered the planned trajectory (feedback control) (Messier and Kalaska,). Five adult speakers produced CV and VC syllables with high, mid, or low vowels while movements of the tongue and jaw were tracked electromagnetically. The correspondence between the kinematic parameters peak acceleration or peak velocity and movement extent as well as between the articulators' spatial coordinates at those kinematic landmarks and movement endpoint was examined both for movements across different target distances (i.e., across vowel height) and within target distances (i.e., within vowel height). Taken together, results suggest that jaw and tongue movements for these CV and VC syllables are mostly under feedforward control but with feedback-based contributions. One type of feedback-driven compensatory adjustment appears to regulate movement duration based on variation in peak acceleration. Results from a statistical model based on multiple regression are presented to illustrate how the relative strength of these feedback contributions can be estimated.
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