Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli.
Three-Dimensional Motion Perception: Comparing Speed and Speed Change Discrimination for Looming Stimuli.
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DOI：
10.3390/vision4030033
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发表时间：
2020-07-06
期刊：
影响因子：
--
通讯作者：
Harris JM
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文献类型：
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作者：
Lee ARI;Ales JM;Harris JM
判断物体在三维空间中的运动速度在我们的日常生活中很重要，因为我们在三维世界中与物体互动。然而，速度感知很少研究深度运动，特别是当使用单眼线索时，如若隐若现。在这里，我们比较了速度辨别和速度变化辨别，对于迫在眉睫的刺激，为了更好地理解哪些视觉信息被用于这些任务。对于速度辨别任务，我们操纵了可用的距离和持续时间信息，以调查参与者是否专门使用速度信息。对于速度变化判别，总距离和持续时间保持不变；因此，它们不能用于成功地执行该任务。对于速度变化辨别任务，我们的数据与观察者在一段时间内对速度变化没有特异性反应是一致的。相反，他们可能使用了另一种可能不太理想的策略来完成任务。有证据表明，参与者在完成速度辨别任务时使用了多种线索，而不仅仅是依赖于速度。此外，我们的数据表明，参与者可能会在一次又一次的试验中切换线索。我们得出结论，若隐若现的刺激的速度变化并没有被用于速度变化辨别任务，并且naïve参与者可能并不总是只使用速度来进行速度辨别。
Judging the speed of objects moving in three dimensions is important in our everyday lives because we interact with objects in a three-dimensional world. However, speed perception has been seldom studied for motion in depth, particularly when using monocular cues such as looming. Here, we compared speed discrimination, and speed change discrimination, for looming stimuli, in order to better understand what visual information is used for these tasks. For the speed discrimination task, we manipulated the distance and duration information available, in order to investigate if participants were specifically using speed information. For speed change discrimination, total distance and duration were held constant; hence, they could not be used to successfully perform that task. For the speed change discrimination task, our data were consistent with observers not responding specifically to speed changes within an interval. Instead, they may have used alternative, arguably less optimal, strategies to complete the task. Evidence suggested that participants used a variety of cues to complete the speed discrimination task, not always solely relying on speed. Further, our data suggested that participants may have switched between cues on a trial to trial basis. We conclude that speed changes in looming stimuli were not used in a speed change discrimination task, and that naïve participants may not always exclusively use speed for speed discrimination.