Clark Sean, Riley Michael A
Department of Movement Science, Gordon College, 255 Grapevine Rd, Wenham, MA 01984, USA.
Exp Brain Res. 2007 Jan;176(2):299-310. doi: 10.1007/s00221-006-0620-6.
The authors investigated the multisensory control of posture by altering sensory information across the visual and somatosensory systems. The support surface and visual surround were sway-referenced to anterior/posterior center of mass sway and the gain between postural sway and degree of sway referencing was manipulated (gain settings were 0.2, 1.0, and 1.8). These alterations in the sensory environment lead to observed changes in the temporal structure of the center of pressure (COP) trajectories. COP path length increased across gain settings while COP coefficient of variation decreased. The COP became increasingly more deterministic across more challenging sensory organization test (SOT) conditions and with increasing gain, and more nonstationary across more challenging SOT conditions and when the support surface was sway-referenced using a 1.8 gain setting. These findings indicate that changes in the responsiveness of the support surface and/or visual surround within each of the sway-referenced SOT conditions had functional consequences for the control of posture as evidenced by the variations in postural sway dynamics.
作者通过改变视觉和躯体感觉系统的感觉信息，研究了姿势的多感官控制。支撑面和视觉环境以前后重心摆动为参考进行摆动，并操纵姿势摆动与摆动参考程度之间的增益（增益设置为0.2、1.0和1.8）。感觉环境的这些改变导致观察到压力中心（COP）轨迹时间结构的变化。COP路径长度在增益设置范围内增加，而COP变异系数降低。在更具挑战性的感觉组织测试（SOT）条件下，随着增益增加，COP变得越来越具有确定性；在更具挑战性的SOT条件下以及当支撑面以1.8的增益设置进行摆动参考时，COP变得更加非平稳。这些发现表明，在每个摆动参考的SOT条件下，支撑面和/或视觉环境反应性的变化对姿势控制具有功能性影响，姿势摆动动力学的变化证明了这一点。
