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首页> 外文期刊>Neuroscience: An International Journal under the Editorial Direction of IBRO >DRIFTING WHILE STEPPING IN PLACE IN OLD ADULTS: ASSOCIATION OF SELF-MOTION PERCEPTION WITH REFERENCE FRAME RELIANCE AND GROUND OPTIC FLOW SENSITIVITY
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DRIFTING WHILE STEPPING IN PLACE IN OLD ADULTS: ASSOCIATION OF SELF-MOTION PERCEPTION WITH REFERENCE FRAME RELIANCE AND GROUND OPTIC FLOW SENSITIVITY

机译：在旧成年人踩踏时漂移：自动运动感应与参考帧依赖的关联和地光学流动灵敏度

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Optic flow provides visual self-motion information and is shown to modulate gait and provoke postural reactions. We have previously reported an increased reliance on the visual, as opposed to the somatosensorybased egocentric, frame of reference (FoR) for spatial orientation with age. In this study, we evaluated FoR reliance for self-motion perception with respect to the ground surface. We examined how effects of ground optic flow direction on posture may be enhanced by an intermittent podal contact with the ground, and reliance on the visual FoR and aging. Young, middle-aged and old adults stood quietly (QS) or stepped in place (SIP) for 30 s under static stimulation, approaching and receding optic flow on the ground and a control condition. We calculated center of pressure (COP) translation and optic flow sensitivity was defined as the ratio of COP translation velocity over absolute optic flow velocity: the visual self-motion quotient (VSQ). COP translation was more influenced by receding flow during QS and by approaching flow during SIP. In addition, old adults drifted forward while SIP without any imposed visual stimulation. Approaching flow limited this natural drift and receding flow enhanced it, as indicated by the VSQ. The VSQ appears to be a motor index of reliance on the visual FoR during SIP and is associated with greater reliance on the visual and reduced reliance on the egocentric FoR. Exploitation of the egocentric FoR for self-motion perception with respect to the ground surface is compromised by age and associated with greater sensitivity to optic flow. (C) 2017 IBRO. Published by Elsevier Ltd. All rights reserved.
机译：光学流量提供视觉自动运动信息，并显示出调节步态并引发姿势反应。我们之前报道了对视觉的依赖性增加，而不是躯体病，与年龄的空间取向相反，参考框架（用于）。在这项研究中，我们评估了对地面的自动运动感知的依赖。我们检查了地面光学流动方向对姿势的效果如何通过与地面间歇性的帕尔接触来增强，并且依赖视觉效果和老化。在静态刺激下，年轻，中年和旧成年人静静地静静地（QS）或阶梯（SIP），在地面接近和后退光学流动和控制条件下。我们计算了压力中心（COP）平移和光学流动灵敏度被定义为通过绝对光学流速的COP翻译速度的比率：视觉自动运动速度（VSQ）。通过在QS期间的流动并通过在SIP期间接近流动来影响COP翻译。此外，老年人向前漂流，同时啜饮没有任何施加的视觉刺激。接近流量限制这种自然漂移和后退流量增强了它，如VSQ所示。 VSQ似乎是在SIP期间对视觉依赖的电机指标，并且与对视觉和降低对Enocentric的依赖性相关的相关联。对接地表面的自动运动感知的自体运动感知的开发受到年龄的损害，并且与对光学流量的更大敏感性相关。 （c）2017年IBRO。 elsevier有限公司出版。保留所有权利。

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