Amblard B, Assaiante C, Fabre J C, Mouchnino L, Massion J
UPR Neurobiologie et Mouvements, CNRS, Marseille, France.
Exp Brain Res. 1997 Apr;114(2):214-25. doi: 10.1007/pl00005630.
The ability voluntarily to stabilize the head in space during lateral rhythmic oscillations (0.59+/-0.09 Hz) of the trunk has been investigated during microgravity (microG) and normal gravity (nG) conditions (parabolic flights). Five healthy young subjects, who gave informed consent, were examined. The movements were performed with eyes open or eyes closed, during phases of either microG or nG. The main result was that head orientation with respect to vertical may be stabilized about the roll axis under microG with, as well as without vision, despite the reduction in vestibular afferent and muscle proprioceptive inputs. Moreover, the absence of head stabilization about the yaw axis confirms that the degrees of freedom of the neck can be independently controlled, as was previously reported. These results seem to indicate that voluntary head stabilization does not depend crucially upon static vestibular afferents. Head stabilization in space may in fact be organized on the basis of either dynamic vestibular afferents or a short-term memorized postural body schema.
在微重力（microG）和正常重力（nG）条件下（抛物线飞行），研究了在躯干横向节律性摆动（0.59±0.09赫兹）期间自愿在空间中稳定头部的能力。检查了五名签署知情同意书的健康年轻受试者。在微重力或正常重力阶段，受试者睁眼或闭眼进行动作。主要结果是，尽管前庭传入和肌肉本体感觉输入减少，但在微重力条件下，无论有无视觉，头部相对于垂直方向的方位均可围绕横滚轴稳定。此外，绕偏航轴缺乏头部稳定证实了颈部的自由度可以独立控制，正如先前报道的那样。这些结果似乎表明，自愿性头部稳定并不关键地依赖于静态前庭传入。实际上，空间中的头部稳定可能是基于动态前庭传入或短期记忆的姿势身体模式来组织的。
