Two independent mechanisms for motion-in-depth perception: evidence from individual differences.
Two independent mechanisms for motion-in-depth perception: evidence from individual differences.
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DOI：
10.3389/fpsyg.2010.00155
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发表时间：
2010
影响因子：
3.8
通讯作者：
Harris JM
中科院分区：
文献类型：
--
作者：
Nefs HT;O'Hare L;Harris JM
我们的前视使我们能够利用双目视觉信息的优势：利用右眼和左眼视角之间的微小差异来了解三维的深度和位置。我们的视觉系统还包含专门的机制来检测双目视觉中的深度运动，但这些机制的性质仍然存在争议。理论上，双目深度运动感知可以基于首先检测双目视差，然后监测其随时间的变化。另一种方法是分别监测右眼和左眼的运动，然后比较这些运动信号。在这里，我们使用了个体差异的方法来测试这两个信息源是否通过分离的机制处理，并衡量这些机制的相对重要性。我们的结果表明，存在两种不同的机制，每一种机制都有助于大多数观察者对深度运动的感知。此外，我们第一次展示了这两种机制在正常人群中的相对流行率。一般来说，视觉系统似乎主要依赖于对双眼视差变化敏感的机制，但深度运动的感知通过使用眼间速度差的不那么敏感的机制的存在而得到增强。偶尔，我们会发现观察者的敏感度与之相反。更广泛地说，这项工作展示了个体差异方法在研究认知系统的功能组织方面的力量。
Our forward-facing eyes allow us the advantage of binocular visual information: using the tiny differences between right and left eye views to learn about depth and location in three dimensions. Our visual systems also contain specialized mechanisms to detect motion-in-depth from binocular vision, but the nature of these mechanisms remains controversial. Binocular motion-in-depth perception could theoretically be based on first detecting binocular disparity and then monitoring how it changes over time. The alternative is to monitor the motion in the right and left eye separately and then compare these motion signals. Here we used an individual differences approach to test whether the two sources of information are processed via dissociated mechanisms, and to measure the relative importance of those mechanisms. Our results suggest the existence of two distinct mechanisms, each contributing to the perception of motion-in-depth in most observers. Additionally, for the first time, we demonstrate the relative prevalence of the two mechanisms within a normal population. In general, visual systems appear to rely mostly on the mechanism sensitive to changing binocular disparity, but perception of motion-in-depth is augmented by the presence of a less sensitive mechanism that uses interocular velocity differences. Occasionally, we find observers with the opposite pattern of sensitivity. More generally this work showcases the power of the individual differences approach in studying the functional organization of cognitive systems.
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影响因子：
1.8
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通讯作者：
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