The Influence of Head Position on Postural Vertical

描述（由申请人提供）：本研究的长期目标是进一步了解颈椎体感和前庭信息在空间体位检测和姿势反应生成中的相互作用。来自颈部传入、视觉、躯体感觉和前庭系统的信息被整合以形成头部和躯干在空间中的三维表示，用于产生适当的平衡反应。以前的研究与前庭电刺激和视觉流刺激表明，头对躯干的位置影响的方向所产生的姿势摇摆。Horak和Peterka开发的前庭-体感相互作用的新模型表明，正弦振荡受试者站立的平台增加了用于形成姿势反应的前庭信息的权重。我们将使用这个模型来研究对照组和单侧前庭病变组的颈传入神经和前庭系统之间的相互作用。在实验1中，我们将确定是否横向偏置的姿势垂直度正弦表面振荡过程中观察到的头部朝前将改变到一个更前/后偏置时，头部旋转。在实验2中，我们将确定是否会观察到垂直度的横向偏差，在不同的头部位置american。

DESCRIPTION (provided by applicant): The long-term goal of this research is to further understand the interaction between cervical somatosensory and vestibular information in the detection of body position in space and in generating postural responses. Information from the cervical afferents, visual, somatosensory and vestibular systems are integrated to form a three dimensional representation of the head and trunk in space for the generation of appropriate balance responses. Previous studies with galvanic vestibular stimulation and visual flow stimulation have shown that head-on-trunk position influences the direction of the resultant postural sway. A new model of vestibular-somatosensory interaction developed by Horak and Peterka have shown that sinusoidally oscillating a platform on which a subject stands increases the weighting of vestibular information for the formation of postural responses. We will use this model to investigate the interaction between cervical afferents and the vestibular system in control subjects, and subjects with unilateral vestibular lesions. In experiment 1 we will determine whether the lateral bias of postural verticality observed during sinusoidal surface oscillations with the head facing forward will change to a more anterior/ posterior bias when the head is rotated. In experiment 2 we will determine whether the lateral bias of verticality will be observed during ambulation with various head positions.