Vestibular-evoked reflexive head movements and their dependence on the body's orientation in space.
Vestibular-evoked reflexive head movements and their dependence on the body's orientation in space.
复制标题
前庭诱发的反射性头部运动及其对身体空间方向的依赖性。
DOI：
10.1109/iembs.2006.260611
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Green,A
中科院分区：
文献类型：
--
作者：
Gdowski,GT;Duarte,SP;Green,A
当身体在空间中被动移动时，头部的质量会对颈椎施加力。假设全身运动期间颈部肌肉组织的反射性激活可以抵消头部的惯性力。然而，即使身体在太空中静止，重力加速度也会对身体的各个部分施加力。抵消这种力很复杂，因为它会随着身体相对于重力的方向的变化而变化。在这项研究中，我们重点研究了前庭结肠反射的一个子集，这些反射在整个身体旋转时起到稳定头部的作用。松鼠猴记录了响应全身旋转而产生的反射性头部运动的运动学。依次操纵身体的方向，以确定重力如何影响反射性头部运动的运动学。在低刺激频率下仅观察到反射性头部运动增益的微小变化。相反，在较高的刺激频率下观察到较大的增益变化。这些结果表明，前庭系统补偿身体在空间中的方向，同时在身体低频扰动期间调节头部相对于躯干的姿势稳定性。
When the body is passively moved in space the mass of the head imposes force on the cervical spinal column. Reflexive activation of the neck musculature during whole body motion is hypothesized to function to counteract the inertial forces of the head. However, even when the body is stationary in space gravitational acceleration imposes force on segments of the body. Counteracting this force is complicated because it changes as the body's orientation changes with respect to gravity. In this study, we have focused on a subset of vestibulo-collic reflexes that act to stabilize the head when the whole body is rotated. The kinematics of reflexive head movements produced in response to whole body rotation were recorded from Squirrel Monkeys. The orientation of the body was sequentially manipulated to determine how gravity influences the kinematics of the reflexive head movements. Only small changes in reflexive head movement gain were observed at low stimulus frequencies. In contrast, larger changes in gain were observed at higher stimulus frequencies. These results suggest the vestibular system compensates for the body's orientation in space while regulating the postural stability of the head with respect to the trunk during low frequency perturbations of the body.