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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三维运动感知：比较速度和速度变化辨别迫在眉睫的刺激
DOI：
10.1101/2020.04.03.023879
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Lee A
中科院分区：
文献类型：
--
作者：
Lee A
判断物体在三维空间中移动的速度在我们的日常生活中很重要，因为我们与三维世界中的物体互动。然而，很少对深度运动的速度感知进行研究，特别是在使用诸如隐约可见的单目线索时。在这里，我们比较了速度歧视，速度变化的歧视，隐现的刺激，为了更好地了解什么视觉信息是用于这些任务。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。对于速度变化辨别，总距离和持续时间保持恒定;因此，它们不能用于成功地执行该任务。对于速度变化的歧视任务，我们的数据是一致的，观察员没有专门响应速度变化的时间间隔内。相反，他们可能会使用替代的，可以说不太理想的策略来完成任务。有证据表明，参与者使用各种线索来完成速度辨别任务，而不仅仅是依靠速度。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在线索之间进行切换。我们的结论是，在若隐若现的刺激的速度变化没有用于速度变化的歧视任务，天真的参与者可能并不总是专门使用速度的速度歧视。
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.