Enhancing memory of stair height by the motor experience of stepping
Enhancing memory of stair height by the motor experience of stepping
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DOI：
10.1007/s00221-012-3269-3
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发表时间：
2012-11-01
影响因子：
2
通讯作者：
Pearson, Keir
中科院分区：
文献类型：
--
作者：
Shinya, Masahiro;Popescu, Adrian;Pearson, Keir
从最近的四足动物避障研究中出现的一个概念是，通过视觉信息建立的障碍物高度的工作记忆通过与障碍物的运动相互作用而增强。在这项调查中，我们发现，这个概念是有效的，在成年人观看和走上楼梯。主要的发现是，与仅通过视觉获得有关楼梯高度的信息相比，通过走上一段短楼梯获得有关楼梯高度的信息时，楼梯高度的记忆得到了增强。通过测量受试者踏上楼梯时的最大脚趾间隙，我们观察到，在迈步前将视线从楼梯转移几秒钟后，最大脚趾间隙增加。这种增加大部分发生在转移视线从楼梯和启动步骤之间的2秒时间内。相比之下，这种增加的最大脚趾间隙转移后，从楼梯的视觉显着减少后，受试者走上两个楼梯之前，走上楼梯没有视觉。这种减少持续延迟长达10秒之间转移视线从楼梯和启动步骤。在12名受试者中，有4名在长时间看不到楼梯后的最大脚趾间隙接近于在完全看到楼梯的情况下迈步时的值。
A concept emerging from recent studies on obstacle avoidance in quadrupeds is that working memory of the height of an obstacle established by visual information is enhanced by motor interactions with the obstacle. In this investigation, we found that this concept is valid in adult humans when viewing and walking up stairs. The main finding was that the memory of the height of stairs was enhanced when information about stair height was gained by walking up a short flight of stairs compared to when information about stair height was gained by vision alone. By measuring the maximum toe clearance when subjects step onto a stair, we observed that maximum toe clearance increased after diverting vision from the stair for a few seconds prior to stepping. Most of this increase occurred within a 2-s period between diverting vision from the stair and initiating the step. By contrast, this increase in maximum toe clearance after diverting vision from a stair was significantly reduced after subjects walked up two stairs prior to stepping onto a stair without vision. This reduction persisted for delays as long as 10 s between diverting vision from the stair and initiating the step. In four of twelve subjects, the maximum toe clearance after these long periods without vision of the stair was close to the value when steps were made with full vision of the stairs.