Erkelens C J, Muijs A J, van Ee R
Helmholtz Instituut, Utrecht University, The Netherlands.
Vision Res. 1996 Jul;36(14):2141-7. doi: 10.1016/0042-6989(95)00268-5.
A generally accepted notion in binocular vision is that we see the world as if viewed by a single eye, the cyclopean eye. A consequence of seeing the world from a single point in space is that the outlines of occluding and occluded surfaces have the same shape. We designed stereograms in which subjects aligned binocularly visible lines to each other. The lines were lying in different depth planes. In the vicinity of occluded areas, binocular alignment was achieved by alignment of the lines in the eye that viewed the monocularly visible details. Stereograms in which shapes of surfaces lying in different depth planes were compared to each other show that occluding and occluded surfaces do not have the same shape: a square surface occludes rectangular surfaces in other depth planes of which the horizontal widths are smaller than the vertical widths. This difference is perceived shape is not possible if the centre of binocular direction has a fixed position in the head.
双眼视觉中一个普遍接受的观点是，我们看世界就好像是用一只独眼，即独眼巨人之眼在看。从空间中的一个单点看世界的一个结果是，遮挡表面和被遮挡表面的轮廓具有相同的形状。我们设计了立体图，让受试者将双眼可见的线条相互对齐。这些线条位于不同的深度平面。在遮挡区域附近，通过观察单眼可见细节的眼睛中的线条对齐来实现双眼对齐。将位于不同深度平面的表面形状相互比较的立体图显示，遮挡表面和被遮挡表面没有相同的形状：一个正方形表面会遮挡其他深度平面中的矩形表面，这些矩形表面的水平宽度小于垂直宽度。如果双眼方向的中心在头部有一个固定位置，这种感知到的形状差异是不可能的。
