Nicholls Michael E R, Hadgraft Nyssa T, Chapman Heidi L, Loftus Andrea M, Robertson Joanne, Bradshaw John L
Flinders University, Bedford Park, South Australia, Australia.
Atten Percept Psychophys. 2010 Aug;72(6):1576-90. doi: 10.3758/APP.72.6.1576.
In contrast to the leftward inattention caused by right parietal damage, normal brain function shows a subtle neglect of the right and left sides in peripersonal and extrapersonal space, respectively. This study explored how these attentional biases cause healthy individuals to collide with objects on the right. In Experiment 1, participants navigated manual and electric wheelchairs through a narrow doorway. More rightward collisions were observed for the electric, but not the manual, wheelchair. Experiment 2 demonstrated that the rightward deviation for electric wheelchairs increased for wider doorways. Experiment 3 established that the rightward deviation is not the result of task-related vestibular input, using a remote control device to operate the wheelchair. The rightward deviation persisted in Experiment 4 when the doorway was removed, suggesting that the bias is the result of a mis-bisection of space. In Experiment 5, the rightward bias was replicated using an electric scooter, which is steered using handlebars. Finally, Experiment 6 required participants to point to the middle of the doorway, using a laser, before moving the scooter. Rightward mis-bisection was observed in both conditions. Rightward mis-bisection of lines in extrapersonal space provides the most parsimonious explanation of the rightward collisions and deviations.
与右侧顶叶损伤导致的左侧疏忽不同，正常脑功能在个人空间和个人周边空间中分别表现出对右侧和左侧的细微疏忽。本研究探讨了这些注意力偏差如何导致健康个体与右侧物体发生碰撞。在实验1中，参与者乘坐手动轮椅和电动轮椅穿过一扇狭窄的门。电动轮椅观察到更多的向右碰撞，而手动轮椅则没有。实验2表明，电动轮椅的向右偏差在更宽的门时会增加。实验3通过使用遥控装置操作轮椅，确定向右偏差不是与任务相关的前庭输入的结果。当门被移除时，实验4中向右偏差仍然存在，这表明这种偏差是空间二等分错误的结果。在实验5中，使用通过车把转向的电动滑板车复制了向右偏差。最后，实验6要求参与者在移动滑板车之前，使用激光指向门的中间。在两种情况下都观察到向右二等分错误。个人周边空间中线条的向右二等分错误为向右碰撞和偏差提供了最简洁的解释。
