How visual information links to multijoint coordination during quiet standing
How visual information links to multijoint coordination during quiet standing
复制标题
安静站立时视觉信息如何与多关节协调联系起来
DOI：
10.1007/s00221-012-3210-9
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发表时间：
2012
影响因子：
2
通讯作者：
Kiemel
中科院分区：
文献类型：
--
作者：
Scholz;Schöner;Kiemel
基于非控制流形（UCM）假设框架的多自由度模型研究了视觉信息与姿态控制之间的联系。假设是，由于视觉信息指定了身体在空间中的位置，它将优先耦合到那些在空间中移动身体的自由度（dof）组合中，而不是与不在空间中移动身体的自由度组合中。受试者安静地站在虚拟现实洞穴中进行4分钟的试验，有或没有低于感知阈值的0.2、2.0 Hz或0.2和2.0 Hz的视野扰动。采用运动分析计算了6个矢状面关节角。角运动随时间的方差被划分为(1)与身体运动相关的方差和(2)反映使用灵活关节组合保持头部前后位置（HDPOS）和质心（CMPOS）不变的方差。在频域中进行UCM分析，以便将感官扰动与不同频率下的每个方差分量联系起来。正如预测的那样，在0.2 hz的驱动频率下，与身体运动相关的方差有选择性地增加，而在其他频率的摇摆下，cmposs和HDPOS都没有增加。2.0 hz视觉驱动的主导效应也主要局限于与身体运动相关的方差。
The link between visual information and postural control was investigated based on a multi-degree-of-freedom model using the framework of the uncontrolled manifold (UCM) hypothesis. The hypothesis was that because visual information specifies the position of the body in space, it would couple preferentially into those combinations of degrees of freedom (DOFs) that move the body in space and not into combinations of DOFs that do not move the body in space. Subjects stood quietly in a virtual reality cave for 4-min trials with or without a 0.2, 2.0 Hz, or combined 0.2 and 2.0 Hz visual field perturbation that was below perceptual threshold. Motion analysis was used to compute six sagittal plane joint angles. Variance across time of the angular motion was partitioned into (1) variance associated with motion of the body and (2) variance reflecting the use of flexible joint combinations that keep the anterior–posterior positions of the head (HDPOS) and center of mass (CMPOS) invariant. UCM analysis was performed in the frequency domain in order to link the sensory perturbation to each variance component at different frequencies. As predicted, variance related to motion of the body was selectively increased at the 0.2-Hz drive frequency but not at other frequencies of sway for both CMPOSand HDPOS. The dominant effect with the 2.0-Hz visual drive also was limited largely to variance related to motion of the body.
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影响因子：
1.9
作者：
van der Kooij, H;Jacobs, R;Grootenboer, H
通讯作者：
Grootenboer, H
DOI：
10.1115/1.2834295
发表时间：
1998-02-01
影响因子：
1.7
作者：
Kuo, AD
通讯作者：
Kuo, AD
人类长期失重状态下腿部外展缺乏质量控制中心
影响因子：
2.5
作者：
A. Pedrocchi;G. Baroni;L. Mouchnino;G. Ferrigno;A. Pedotti;J. Massion
通讯作者：
J. Massion
影响因子：
1.1
作者：
Zatsiorsky, VM;Duarte, M
通讯作者：
Duarte, M
影响因子：
29.3
作者：
FELDMAN, AG;LEVIN, MF
通讯作者：
LEVIN, MF