Department of Cognitive Sciences, University of California, Irvine, CA 92697, USA.
Department of Language Science, University of California, Irvine, CA 92697, USA.
Brain. 2023 May 2;146(5):1775-1790. doi: 10.1093/brain/awac454.
Classical neural architecture models of speech production propose a single system centred on Broca's area coordinating all the vocal articulators from lips to larynx. Modern evidence has challenged both the idea that Broca's area is involved in motor speech coordination and that there is only one coordination network. Drawing on a wide range of evidence, here we propose a dual speech coordination model in which laryngeal control of pitch-related aspects of prosody and song are coordinated by a hierarchically organized dorsolateral system while supralaryngeal articulation at the phonetic/syllabic level is coordinated by a more ventral system posterior to Broca's area. We argue further that these two speech production subsystems have distinguishable evolutionary histories and discuss the implications for models of language evolution.
传统的语音产生神经架构模型提出了一个以布洛卡区为中心的单一系统，协调从嘴唇到喉咙的所有发声器官。现代证据不仅对布洛卡区参与言语运动协调的观点提出了挑战，而且对只有一个协调网络的观点也提出了挑战。本文广泛借鉴了各种证据，提出了一个双重言语协调模型，其中，与音高相关的韵律和歌曲的喉部控制由一个层次化的背外侧系统协调，而超声道的语音/音节水平的发音由位于布洛卡区后部的更腹侧系统协调。我们进一步认为，这两个言语产生子系统具有可区分的进化历史，并讨论了其对语言进化模型的影响。
