Holden M, Ventura J, Lackner J R
Ashton Graybiel Spatial Orientation Laboratory, Brandeis University, Waltham, Massachusetts 02254.
J Vestib Res. 1994 Jul-Aug;4(4):285-301.
Postural sway during quiet stance increases if sight of the surroundings is denied. We studied how sensory-motor information about body displacement provided by contact of the index finger with a stationary bar can be used to stabilize balance in the absence of vision. Stabilization equivalent to the contribution conferred by vision was achieved at contact force levels less than 1 N. This value is much below that necessary to provide significant physical stabilization of the body. We interpret our findings in relation to tactile thresholds for motion detection, "precision grip," and proprioceptive and sensory-motor information about the configuration of the arm to the torso. In conditions allowing higher force levels at the fingertip (5-8 N), subjects assumed a passively stable state to stabilize their stance.
如果看不到周围环境，安静站立时的姿势摇摆会增加。我们研究了食指与固定杆接触所提供的有关身体位移的感觉运动信息如何在没有视觉的情况下用于稳定平衡。在接触力水平小于1牛顿时，实现了与视觉贡献相当的稳定。该值远低于为身体提供显著物理稳定所需的值。我们根据运动检测的触觉阈值、“精确抓握”以及手臂与躯干配置的本体感觉和感觉运动信息来解释我们的发现。在允许指尖施加更高力水平（5-8牛顿）的情况下，受试者呈现出被动稳定状态以稳定其姿势。
