Department of Optometry and Visual Science, Buskerud University College, Kongsberg, Norway.
PLoS One. 2012;7(3):e33782. doi: 10.1371/journal.pone.0033782. Epub 2012 Mar 29.
It has long been assumed that there is a distorted mapping between real and 'perceived' space, based on demonstrations of systematic errors in judgements of slant, curvature, direction and separation. Here, we have applied a direct test to the notion of a coherent visual space. In an immersive virtual environment, participants judged the relative distance of two squares displayed in separate intervals. On some trials, the virtual scene expanded by a factor of four between intervals although, in line with recent results, participants did not report any noticeable change in the scene. We found that there was no consistent depth ordering of objects that can explain the distance matches participants made in this environment (e.g. A>B>D yet also A<C<D) and hence no single one-to-one mapping between participants' perceived space and any real 3D environment. Instead, factors that affect pairwise comparisons of distances dictate participants' performance. These data contradict, more directly than previous experiments, the idea that the visual system builds and uses a coherent internal 3D representation of a scene.
长期以来，人们一直认为，在判断倾斜度、曲率、方向和距离时，存在真实空间和“感知”空间之间的扭曲映射，这些都是基于对系统误差的演示。在这里，我们对一致视觉空间的概念进行了直接测试。在沉浸式虚拟环境中，参与者判断在两个单独间隔中显示的两个正方形的相对距离。在某些试验中，虚拟场景在间隔之间扩展了四倍，尽管与最近的结果一致，参与者没有报告场景有任何明显变化。我们发现，没有一致的深度顺序对象可以解释参与者在这种环境中做出的距离匹配（例如 A>B>D 但也有 A<C<D），因此，参与者的感知空间和任何真实的 3D 环境之间没有单一的一一对应映射。相反，影响距离成对比较的因素决定了参与者的表现。这些数据比以前的实验更直接地反驳了视觉系统构建和使用场景的一致内部 3D 表示的观点。
