Visual feedback in the lower visual field affects postural control during static standing
Visual feedback in the lower visual field affects postural control during static standing
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DOI：
10.1016/j.gaitpost.2022.07.004
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发表时间：
2022-07-14
期刊：
影响因子：
2.4
通讯作者：
Asaka, Tadayoshi
中科院分区：
文献类型：
--
作者：
Mani, Hiroki;Kato, Norio;Asaka, Tadayoshi
背景：背顶叶视觉系统在自我运动感知和空间认知中发挥着重要作用。它还对来自下视野的视觉输入做出强烈反应。根据可用感觉源的可靠性，在称为感觉重新加权的过程中修改姿势控制。呈现给下视野或上视野的视觉刺激是否影响姿势控制和感觉重新加权的问题尚未得到解决。研究问题：下视野和上视野的视觉刺激是否会影响姿势控制和感觉重估？方法：29 名健康的年轻人参与了这项研究。使用头戴式显示器在 VR 环境中模拟四种条件（全视野、上视野、下视野和无光流条件）。使用的光流刺激是一群白色的小球，它们从视野的中心点开始，径向地向周边移动，并在整个场景中扩展。参与者被要求在每种视觉条件下安静站立 50 秒。使用测力台信号，我们测量了水平面上的压力中心 (COP) 信号，并计算了其 95% 椭圆面积、均方根 (RMS) 偏差、平均速度和功率谱密度 (PSD)。结果：与上视野中的光流相比，全视野和下视野中的光流产生的 95% 椭圆面积和前后方向 COP 的 RMS 显着更小。此外，与上视野相比，下视野的较低频带（0-0.3 Hz）的PSD减小，而较高频带（0.3-1 Hz和1-3 Hz）的PSD增大。意义：与上视野相比，下视野中的视觉反馈对静态姿势控制的影响更大。
Background: The dorsal parietal visual system plays an important role in self-motion perception and spatial cognition. It also strongly responds to visual inputs from the lower visual field. Postural control is modified in a process called sensory reweighting based on the reliability of available sensory sources. The question of whether visual stimuli presented to either the lower or upper visual field affect postural control and sensory reweighting has not been resolved. Research question: Do visual stimuli presented to the lower and upper visual fields affect postural control and sensory reweighting? Methods: Twenty-nine healthy young adults participated in the study. Four conditions (full visual field, upper visual field, lower visual field, and no optic flow condition) were simulated in a VR environment using a headmounted display. The optic flow stimuli used were swarms of small white spheres originating from the central point of the visual field, moving radially towards the periphery, and expanding across the scene. Participants were instructed to stand quietly for 50 s under each visual condition. Using force plate signals, we measured the center of pressure (COP) signal in the horizontal plane and calculated its 95 % ellipse area, root mean square (RMS) deviations, the mean velocity, and power spectral density (PSD). Results: Optic flow in the full and lower visual fields produced significantly smaller 95 % ellipse area and RMS of COP in the anterior-posterior direction compared to optic flow in the upper visual field. Furthermore, the PSD of the lower frequency band (0-0.3 Hz) was decreased and that of higher frequency bands (0.3-1 Hz and 1-3 Hz) was increased for the lower compared to the upper visual field. Significance: Visual feedback affects static postural control more when presented in the lower visual field compared to the upper visual field.