Spatial representation during locomotion : insight from laterality in spatial cognition

最近的研究表明，认知完整的个体在走过狭窄的门道时，经常会经历向右碰撞。这种方向偏差归因于伪忽视（一种认知因素），其中个体轻微忽视右半脑。本研究探讨了行走脚（运动因素）和主眼（视觉因素）对方向偏误和假性忽略的影响。参与者穿过一个相对较宽的门的中心。上半身中点偏离门口中心的程度表明，穿过门口的脚对方向偏差有很强的影响。一只手的运动和对门一侧的隐蔽注意都会引起身体的对侧偏移。被试在闭上主视眼的情况下，右主视眼通过孔径时受到影响，说明他们依赖于通过主视眼获得的视觉信息。我们的结论是，行走时身体的方向偏差可能是视觉、运动和认知因素共同作用的结果。关于运动因素的参与，结果与基于伪忽略的预测不一致，但与基于注意提示假设的预测一致。

Recent studies indicate that cognitively intact individuals experience frequent rightward collisions while walking through narrow doorways. Such directional bias is attributed to pseudoneglect(a cognitive factor), wherein individuals slightly neglect the right hemispace. The present study is an investigation of the impact of the stepping foot(a motor factor) and dominant eye(visual factor) on the directional bias and of the involvement of pseudoneglect. Participants walked through the perceived center of a relatively wide doorway. The magnitude of the deviation of the upper-body midpoint from the center of the doorway demonstrated that the foot used to step through a doorway had a very strong influence on the directional bias. Both the movement of one hand and covert attention to one side of the door caused contralateral deviation of the body. The participants of the right dominant eye were affected when crossing the aperture while the dominant eye was closed, suggesting that they relied on the visual information obtained through the dominant eye. We concluded that the directional bias in the body during walking could result from a combination of visual, motor and cognitive factors. Regarding the involvement of the motor factors, the results were inconsistent with the predictions based on pseudoneglect but were consistent with predictions based on an attentional cueing hypothesis.