Department of Linguistics, Cornell University, Ithaca, New York, United States of America.
PLoS One. 2013 Apr 24;8(4):e62800. doi: 10.1371/journal.pone.0062800. Print 2013.
studies of the control of complex sequential movements have dissociated two aspects of movement planning: control over the sequential selection of movement plans, and control over the precise timing of movement execution. This distinction is particularly relevant in the production of speech: utterances contain sequentially ordered words and syllables, but articulatory movements are often executed in a non-sequential, overlapping manner with precisely coordinated relative timing. This study presents a hybrid dynamical model in which competitive activation controls selection of movement plans and coupled oscillatory systems govern coordination. The model departs from previous approaches by ascribing an important role to competitive selection of articulatory plans within a syllable. Numerical simulations show that the model reproduces a variety of speech production phenomena, such as effects of preparation and utterance composition on reaction time, and asymmetries in patterns of articulatory timing associated with onsets and codas. The model furthermore provides a unified understanding of a diverse group of phonetic and phonological phenomena which have not previously been related.
对运动计划的顺序选择的控制，以及对运动执行的精确时间的控制。这种区别在言语产生中尤为重要：话语包含按顺序排列的单词和音节，但发音运动通常以非顺序、重叠的方式进行，具有精确协调的相对时间。本研究提出了一种混合动力学模型，其中竞争激活控制运动计划的选择，耦合的振荡系统控制协调。该模型与之前的方法不同，它赋予了音节内发音计划竞争选择的重要作用。数值模拟表明，该模型再现了各种言语产生现象，例如准备和话语组成对反应时间的影响，以及与开头和结尾相关的发音时间模式的不对称。该模型还为一组以前没有相关联的不同的语音和音韵现象提供了统一的理解。
