Is prior knowledge of object geometry used in visually guided reaching?
Is prior knowledge of object geometry used in visually guided reaching?
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DOI：
10.1167/5.6.2
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Franz, VH
中科院分区：
文献类型：
--
作者：
Hartung, B;Schrater, PR;Franz, VH
我们调查了人类是否在视觉引导下使用面部几何形状的先验知识。当观察一张脸的掩模内部时，掩模通常被认为是一个正常的（凸）脸，而不是垂直的、中空的（凹）形状。在这种“空心脸错觉”中，对面部形状的先验知识支配着感知，即使与双眼视差的信息相冲突。正常面和空心面的计算机图像被呈现，使得双眼视差的深度信息与先前的几何知识一致或冲突。参与者要么伸手触摸鼻子或脸颊，要么口头估计相应的距离。我们发现触摸是由面部几何的先验知识主导的。然而，据估计，空心脸比正常脸更平坦。这表明，视觉系统结合了双眼视差和先前的假设，而不是完全忽略其中一个。当比较手触任务和手触任务中空脸错觉的强度时，我们发现，在手触任务和手触任务中，空脸错觉的扁平化效应是相似的。
We investigated whether humans use prior knowledge of the geometry of faces in visually guided reaching. When viewing the inside of a mask of a face, the mask is often perceived as being a normal (convex) face, instead of the veridical, hollow (concave) shape. In this "hollow-face illusion," prior knowledge of the shape of faces dominates perception, even when in conflict with information from binocular disparity. Computer images of normal and hollow faces were presented, such that depth information from binocular disparity was consistent or in conflict with prior knowledge of the geometry. Participants reached to touch either the nose or cheek of the faces or gave verbal estimates of the corresponding distances. We found that reaching to touch was dominated by prior knowledge of face geometry. However, hollow faces were estimated to be flatter than normal faces. This suggests that the visual system combines binocular disparity and prior assumptions, rather than completely discounting one or the other. When comparing the magnitude of the hollow-face illusion in reaching and verbal tasks, we found that the flattening effect of the illusion was similar for verbal and reaching tasks.