Optical flow, spatial orientation, and the control of posture in the elderly.
Optical flow, spatial orientation, and the control of posture in the elderly.
复制标题
老年人的光流、空间定向和姿势控制。
DOI：
10.1093/geronb/50b.1.p51
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Treat-Jacobson,D
中科院分区：
文献类型：
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作者：
Wade,MG;Lindquist,R;Taylor,JR;Treat-Jacobson,D
稳定描记技术被用来更好地了解视觉系统在老年人知觉运动活动中的作用，因为它与保持姿势控制有关。中心研究问题是确定受试者的视觉系统对实验移动房间产生的光流的三种标准条件变化的敏感度。作为该光学流场的函数而存在的任何运动都被记录在力平台上，并以计算的压力中心变量的运动来表示。在基线条件和实验条件下记录压力中心的移动，并根据三种光流条件下的差异以及年轻和老年受试者之间的差异来分析数据。老年受试组对基线条件的反应表现出比年轻受试者更差的稳定性；在调整了基线运动后，比较了年轻受试者和老年受试者对实验条件的反应的压力中心运动。在径向光流条件下，年轻受试者和老年受试者之间没有可靠的差异；在板层流动条件下，老年受试者的运动显著多于年轻受试者；在综合情况下(整体)，在所有记录的运动变量中，老年受试者的移动量显著大于年轻受试者。从老年人跌倒的含义和视觉在静止和运动时维持姿势稳定的作用的生态学解释两个方面对这些结果进行了解释和讨论。
Stabliographic techniques were used to better understand the role of the visual system in the perceptual motor activity of older people as it relates to the maintenance of postural control. The central research question was to determine the sensitivity of the subject's visual system to changes in three standard conditions of optical flow generated by an experimental moving room. Any movement that was present as a function of this optical flow field was recorded on a force platform and expressed in movement of a computed center-of-pressure variable. Movement of the center of pressure was recorded in a baseline condition and in the experimental conditions, and the data were analyzed with respect to differences in the three conditions of optical flow and between both younger and older subjects. The older subject group exhibited less stability than the younger subjects in response to the baseline conditions; and, after adjusting for baseline movement, the center-of-pressure motions of younger and older subjects, in response to the experimental conditions, were compared. No reliable differences were present between younger and older subjects for the radial optical flow condition; in the lamellar flow condition, older subjects moved significantly more than younger subjects; and, in the combined condition (global), the movement of the older subjects was significantly greater than that of the younger subjects for all motion variables recorded. The results are interpreted and discussed both in terms of their implication for falling in the elderly and in the context of an ecological interpretation of the role of vision in maintaining postural stability while both stationary and in motion.