Department of Psychology, Vanderbilt University Nashville, TN, USA.
Front Psychol. 2011 Sep 28;2:245. doi: 10.3389/fpsyg.2011.00245. eCollection 2011.
Perhaps walking and chewing gum is effortless, but walking and tracking moving objects is not. Multiple object tracking is impaired by walking from one location to another, suggesting that updating location of the self puts demands on object tracking processes. Here, we quantified the cost of self-motion in terms of the tracking load. Participants in a virtual environment tracked a variable number of targets (1-5) among distractors while either staying in one place or moving along a path that was similar to the objects' motion. At the end of each trial, participants decided whether a probed dot was a target or distractor. As in our previous work, self-motion significantly impaired performance in tracking multiple targets. Quantifying tracking capacity for each individual under move versus stay conditions further revealed that self-motion during tracking produced a cost to capacity of about 0.8 (±0.2) objects. Tracking your own motion is worth about one object, suggesting that updating the location of the self is similar, but perhaps slightly easier, than updating locations of objects.
也许一边走一边嚼口香糖毫不费力，但一边走一边跟踪移动的物体就不容易了。从一个地方走到另一个地方会损害对多个目标的跟踪能力，这表明更新自身位置会对目标跟踪过程提出要求。在这里，我们根据跟踪负载来量化自身运动的代价。参与者在虚拟环境中在干扰项中跟踪一个可变数量的目标（1-5），同时要么待在一个地方，要么沿着与物体运动相似的路径移动。在每次试验结束时，参与者决定探测点是目标还是干扰项。和我们之前的工作一样，自身运动显著降低了对多个目标的跟踪能力。在移动和静止条件下对每个个体的跟踪能力进行量化，进一步表明跟踪过程中的自身运动对能力的消耗约为 0.8（±0.2）个目标。跟踪自己的运动大约相当于一个目标，这表明更新自身位置与更新目标位置类似，但可能稍微容易一些。
