Simione Meg, Green Jordan R
Department of Pediatrics, MassGeneral Hospital for Children, Boston, USA.
Speech and Feeding Disorders Lab, MGH Institute of Health Professions, 36 1st Avenue, Boston, MA, 02129, USA.
Exp Brain Res. 2018 Mar;236(3):897-906. doi: 10.1007/s00221-018-5183-9. Epub 2018 Jan 23.
The perturbing effects of vibration applied to head and body structures are known to destabilize motor control and elicit corrective responses. Although such vibration response testing may be informative for identifying sensorimotor deficits, the effect of whole-head vibration has not been tested on oromotor control. The purpose of this study was to determine how jaw movements respond to the perturbing effects of whole-head vibration during jaw motor tasks. Ten healthy adults completed speech, chewing, and two syllable repetition tasks with and without whole-head vibration. Jaw movements were recorded using 3D optical motion capture. The results showed that the direction and magnitude of the response were dependent on the task. The two syllable repetition tasks responded to vibration, although the direction of the effect differed for the two tasks. Specifically, during vibration, jaw movements became slower and smaller during the syllable repetition task that imposed speed and spatial precision demands, whereas jaw movements became faster and larger during the syllable repetition task that only imposed speed demands. In contrast, jaw movements were unaffected by the vibration during speech and chewing. These findings suggest that the response to vibration may be dependent on spatiotemporal demands, the availability of residual afferent information, and robust feedforward models.
已知施加于头部和身体结构的振动干扰效应会破坏运动控制并引发纠正反应。尽管这种振动反应测试对于识别感觉运动缺陷可能具有参考价值，但全头部振动对口腔运动控制的影响尚未得到测试。本研究的目的是确定在颌部运动任务期间，颌部运动如何对全头部振动的干扰效应做出反应。十名健康成年人在有和没有全头部振动的情况下完成了言语、咀嚼和两个音节重复任务。使用三维光学动作捕捉记录颌部运动。结果表明，反应的方向和幅度取决于任务。两个音节重复任务对振动有反应，尽管两个任务的效应方向不同。具体而言，在振动期间，在施加速度和空间精度要求的音节重复任务中，颌部运动变得更慢、更小，而在仅施加速度要求的音节重复任务中，颌部运动变得更快、更大。相比之下，言语和咀嚼过程中的颌部运动不受振动影响。这些发现表明，对振动的反应可能取决于时空要求、残余传入信息的可用性以及强大的前馈模型。
