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.

中文翻译：

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在空间中失去了清晰度。局部口颊麻醉对音素发音和可懂度的影响

运动语言需要大量的神经计算，包括前馈和反馈控制机制。正如各种语音控制模型所预测的那样，听觉或体感反馈的减少可能与语言障碍有关。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，评估了减少的体感反馈对个体音素的清晰度和可懂度的影响。使用辅音和元音的感知可懂度估计和运动语音的声学分析的组合进行评估。发现可懂度显着降低，对辅音形成有重大影响。声学分析显示受干扰的强心运动。这些结果强调了体感反馈在言语控制中的临床重要性。