Speech motor learning in profoundly deaf adults.
Speech motor learning in profoundly deaf adults.
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DOI：
10.1038/nn.2193
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发表时间：
2008-10
影响因子：
25
通讯作者：
Ostry, David J.
中科院分区：
文献类型：
--
作者：
Nasir, Sazzad M.;Ostry, David J.
像其他感觉运动行为一样，言语产生依赖于多种感觉输入--听力、来自肌梭的本体感觉输入以及来自声道皮肤和软组织中的机械感受器的皮肤输入。然而，失聪人士对可理解语音的能力表明，体感输入本身可能有助于言语运动控制，甚至可能有助于言语学习。我们评估了接受人工耳蜗植入者在关闭植入物的情况下进行测试的言语运动学习情况。一个机器人设备被用来通过在讲话时移位下巴来改变体感反馈。我们发现，随着训练，植入物的受试者逐渐适应了机械扰动。此外，我们观察到的修正是针对极小的运动偏差，大约在毫米量级，这表明说话者有精确的体感期望。言语运动学习在很大程度上依赖于体感输入。
Speech production, like other sensorimotor behaviors, relies on multiple sensory inputs — audition, proprioceptive inputs from muscle spindles, and cutaneous inputs from mechanoreceptors in the skin and soft tissues of the vocal tract. However, the capacity for intelligible speech by deaf speakers suggests that somatosensory input on its own may contribute to speech motor control and perhaps even to speech learning. We assessed speech motor learning in cochlear implant recipients who were tested with their implants turned off. A robotic device was used to alter somatosensory feedback by displacing the jaw during speech. We found that with training implant subjects progressively adapted to the mechanical perturbation. Moreover, the corrections we observed were for movement deviations that were exceedingly small, on the order of millimetres, indicating that speakers have precise somatosensory expectations. Speech motor learning is significantly dependent on somatosensory input.
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