Effect of environmental factors on how older pedestrians detect an upcoming step
Effect of environmental factors on how older pedestrians detect an upcoming step
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DOI：
10.1177/1477153516669968
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发表时间：
2018-05-01
影响因子：
2.5
通讯作者：
Tyler, N.
中科院分区：
文献类型：
--
作者：
Cheng, T-J;Yang, B.;Tyler, N.
环境特征与老年人在复杂的行人环境中安全走动的能力之间的关系迄今为止知之甚少。具体而言，光水平对行走期间的绊倒危险检测的影响受到的关注相对较少。本研究探讨了在实验室控制环境中，照度对人检测不同高度台阶的能力的影响。16名年轻参与者和15名老年参与者沿着13.2米的走道在200勒克斯或4勒克斯的光照水平下走向上升或下降的台阶。使用眼动仪测量试验时间、注视行为和第一次视觉注视的距离（检测距离）。结果发现，无论是审判时间和检测距离的老年人参与者的影响，而光水平的固定数量和固定时间的年轻参与者的影响，步高。较短的检测距离，更多的固定次数和更长的固定时间被发现在老年参与者，而不是年轻的参与者。结果表明，老年人对即将到来的步骤的视觉信息的处理效率比年轻人慢。这意味着，如果提供更好的照明或简化的视觉环境，老年行人的脆弱性可能会降低。
The relationships between environmental features and older people's ability to safely move around a complex pedestrian environment are, as yet, poorly understood. Specifically, the impact of light levels on trip hazard detection during walking has received relatively little attention. This study investigates the effect of illuminance on people's ability to detect steps of different heights in a laboratory-based controlled environment. Sixteen young and 15 older participants walked along a 13.2 m walkway towards an either ascending or descending step at 200 lux or 4 lux light levels. Trial time, gaze behaviour and distance at which the step was first visually fixated (detection distance) were measured using an eye-tracker. It was found that both the trial time and detection distance of older participants were affected by light level whereas the fixation number and fixation duration of young participants were affected by step-height. Shorter detection distance, greater number of fixations and longer fixation duration were found among older participants as opposed to young participants. The results suggest that the processing efficiency for visual information on an upcoming step is slower among older people than among young people. This implies that the vulnerability of older pedestrians maybe be reduced if better lighting or a simplified visual environment is provided.