Eye movements influence estimation of time-to-contact in prediction motion
Eye movements influence estimation of time-to-contact in prediction motion
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DOI：
10.1007/s00221-010-2416-y
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发表时间：
2010-10-01
影响因子：
2
通讯作者：
Benguigui, Nicolas
中科院分区：
文献类型：
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作者：
Bennett, Simon J.;Baures, Robin;Benguigui, Nicolas
在许多情况下，有必要预测移动物体何时到达给定目标，即使物体可能部分或完全被遮挡。通常情况下，人们会用眼球运动来跟踪移动的物体，但眼球追踪是否有助于准确估计接触时间（TTC）仍不清楚。本研究使用预测运动（PM）任务来检验这个问题，在该任务中，独立小组在物体接近时需要固定到达位置的条件下估计TTC，或者在参与者被指示追求移动物体的条件下估计TTC。该设计包括15个TTC，范围从0.4到1.5秒，三种物体速度（2.5,5,10度/秒）。TTC估计中的常量误差和变量误差随实际TTC的增大而增大。然而，仅在注视组中，物体速度的影响显著，较慢速度的TTC相对高估，较快速度的TTC相对低估。进一步的分析表明，注视组表现出的速度效应与参与者对物体速度的每一个水平表现出相对恒定的误解是一致的。总的来说，这些发现表明，在PM任务中，用眼睛跟踪移动的物体是有优势的。我们解释了不同模式的TTC估计误差时表现出的注视和追求，参考在可用的视网膜和/或视网膜外输入的差异。
In many situations, it is necessary to predict when a moving object will reach a given target even though the object may be partially or entirely occluded. Typically, one would track the moving object with eye movements, but it remains unclear whether ocular pursuit facilitates accurate estimation of time-to-contact (TTC). The present study examined this issue using a prediction-motion (PM) task in which independent groups estimated TTC in a condition that required fixation on the arrival location as an object approached, or a condition in which participants were instructed to pursue the moving object. The design included 15 TTC ranging from 0.4 to 1.5 s and three object velocities (2.5, 5, 10 deg/s). Both constant error and variable error in TTC estimation increased as a function of actual TTC. However, for the fixation group only, there was a significant effect of object velocity with a relative overestimation of TTC for the slower velocity and underestimation for the faster velocity. Further analysis indicated that the velocity effect exhibited by the fixation group was consistent with participants exhibiting a relatively constant misperception for each level of object velocity. Overall, these findings show that there is an advantage in the PM task to track the moving object with the eyes. We explain the different pattern of TTC estimation error exhibited when fixating and during pursuit with reference to differences in the available retinal and/or extra-retinal input.