Department of Rehabilitation Sciences, Ghent University, Corneel Heymanslaan 10, 9000 Ghent, Belgium.
Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, 9000 Ghent, Belgium; Department of Philosophy, Lund University Cognitive Science, Lund University, Box 192, 221 00 Lund, Sweden.
Brain Lang. 2020 Aug;207:104813. doi: 10.1016/j.bandl.2020.104813. Epub 2020 May 20.
Motor speech requires numerous neural computations including feedforward and feedback control mechanisms. A reduction of auditory or somatosensory feedback may be implicated in disorders of speech, as predicted by various models of speech control. In this paper the effects of reduced somatosensory feedback on articulation and intelligibility of individual phonemes was evaluated by using topical anesthesia of orobuccal structures in 24 healthy subjects. The evaluation was done using a combination of perceptual intelligibility estimation of consonants and vowels and acoustic analysis of motor speech. A significantly reduced intelligibility was found, with a major impact on consonant formation. Acoustic analysis demonstrated disturbed diadochokinesis. These results underscore the clinical importance of somatosensory feedback in speech control. The interpretation of these findings in the context of speech control models, neuro-anatomy and clinical neurology may have implications for subtyping of dysarthria.
运动言语需要进行大量的神经计算，包括前馈和反馈控制机制。各种言语控制模型预测，听觉或躯体感觉反馈的减少可能与言语障碍有关。在本文中，通过对 24 名健康受试者的口颊结构进行局部麻醉，评估了躯体感觉反馈减少对单个语音的发音和可懂度的影响。通过对辅音和元音的感知可懂度估计以及言语运动的声学分析相结合的方法进行评估。研究发现，可懂度显著降低，对辅音的形成影响较大。声学分析显示，交替发音受到干扰。这些结果强调了躯体感觉反馈在言语控制中的临床重要性。这些发现结合言语控制模型、神经解剖学和临床神经病学进行解释，可能对构音障碍的分型具有意义。
