Integration of auditory and somatosensory error signals in the neural control of speech movements
Integration of auditory and somatosensory error signals in the neural control of speech movements
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DOI：
10.1152/jn.00638.2010
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发表时间：
2011-08-01
影响因子：
2.5
通讯作者：
Max, Ludo
中科院分区：
文献类型：
--
作者：
Feng, Yongqiang;Gracco, Vincent L.;Max, Ludo
冯Y，葛丽萍VL，马克斯L.言语运动神经控制中听觉和躯体感觉错误信号的整合。J Neurophysiol 106：667-679，2011.首次发表于2011年5月11日; doi：10.1152/jn.00638.2010.-我们研究了听觉和体感反馈对言语神经控制的贡献。在任务I中，通过同时扰动这些感觉模态之一或两种模态来研究感觉运动适应。听觉反馈中的第一共振峰（F1）频率通过实时处理器上移和/或通过机器人设备施加的力场增加或减少钳口张开的程度。所有8名受试者都降低了F1，以补偿反馈信号中的上移F1，而不管下颌是否受到干扰。受试者的声输出的适应性变化是由于下颌或舌头的发音运动的调整。只有当没有施加听觉反馈扰动时，或者当适应力的方向与适应同时声学扰动的方向相兼容时，才发生响应于机械扰动的颌开口程度的适应。在任务II和III中，受试者的听觉和体感的精确度和准确度进行了估计。相关分析显示：1）F1适应程度与F1听觉灵敏度之间的关系; 2）颌位适应程度与颌位体感灵敏度之间的关系均不显著。两者合计，从这项工作的综合研究结果表明，在语音生产，感觉运动适应更新的基本控制机制，以这样一种方式，元音相关的发音运动的规划考虑到了一个复杂的整合错误信号从以前的试验，但可能具有主导作用的听觉模态。
Feng Y, Gracco VL, Max L. Integration of auditory and somatosensory error signals in the neural control of speech movements. J Neurophysiol 106: 667-679, 2011. First published May 11, 2011; doi:10.1152/jn.00638.2010.-We investigated auditory and somatosensory feedback contributions to the neural control of speech. In task I, sensorimotor adaptation was studied by perturbing one of these sensory modalities or both modalities simultaneously. The first formant (F1) frequency in the auditory feedback was shifted up by a real-time processor and/or the extent of jaw opening was increased or decreased with a force field applied by a robotic device. All eight subjects lowered F1 to compensate for the up-shifted F1 in the feedback signal regardless of whether or not the jaw was perturbed. Adaptive changes in subjects' acoustic output resulted from adjustments in articulatory movements of the jaw or tongue. Adaptation in jaw opening extent in response to the mechanical perturbation occurred only when no auditory feedback perturbation was applied or when the direction of adaptation to the force was compatible with the direction of adaptation to a simultaneous acoustic perturbation. In tasks II and III, subjects' auditory and somatosensory precision and accuracy were estimated. Correlation analyses showed that the relationships 1) between F1 adaptation extent and auditory acuity for F1 and 2) between jaw position adaptation extent and somatosensory acuity for jaw position were weak and statistically not significant. Taken together, the combined findings from this work suggest that, in speech production, sensorimotor adaptation updates the underlying control mechanisms in such a way that the planning of vowel-related articulatory movements takes into account a complex integration of error signals from previous trials but likely with a dominant role for the auditory modality.