Amblard B, Assaiante C, Fabre J C, Martin N, Massion J, Mouchnino L, Vernazza S
UPR Neurobiologie et Mouvements, CNRS, Marseille, France.
Acta Astronaut. 1995 Oct-Dec;36(8-12):415-22. doi: 10.1016/0094-5765(95)00126-3.
The ability to voluntarily stabilize the head in space during lateral rhythmic oscillations of the trunk has been investigated during parabolic flights. Five healthy young subjects, who gave informed consent, were examined. The movements were performed with eyes open or eyes closed, either during phases of microgravity or phases of normal gravity. The main result to emerge from this study is that the head may be stabilized in space about the roll axis under microgravity conditions with, as well as without vision, despite the reduction of the vestibular afferent and the 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 it was previously shown. These results seem to indicate that voluntary head stabilization does not depend crucially upon static vestibular afferents. Head stabilization in space may be in fact organized on the basis of either dynamic vestibular afferents or a postural body scheme.
在抛物线飞行过程中，研究了在躯干横向节律性摆动期间，自主稳定头部在空间中的能力。对五名签署知情同意书的健康年轻受试者进行了检查。这些动作在睁眼或闭眼状态下进行，分别处于微重力阶段或正常重力阶段。该研究得出的主要结果是，在微重力条件下，无论有无视觉，尽管前庭传入神经和肌肉本体感觉输入减少，头部仍可围绕横摇轴在空间中稳定。此外，绕偏航轴的头部稳定缺失证实了颈部的自由度可以独立控制，正如之前所表明的那样。这些结果似乎表明，自主头部稳定并不关键地依赖于静态前庭传入神经。实际上，空间中的头部稳定可能是基于动态前庭传入神经或姿势身体模式来组织的。
