Mitchison G J, McKee S P
Kenneth Craik Laboratory, Physiology Department, Cambridge, U.K.
Vision Res. 1990;30(11):1781-91. doi: 10.1016/0042-6989(90)90159-i.
There is a marked anisotropy in the perception of stereoscopic tilt: vertical gradients of horizontal disparity are more easily perceived than horizontal gradients. This could be explained if orientation disparity (the orientation difference in the two eyes' views of the same line) were one of the cues used to determine tilt, since orientation disparities are in general larger for vertical gradients. We show here that a marked anisotropy in tilt perception is present even with stereograms which contain equally strong orientation disparity cues for horizontal and vertical gradients. This implies that there must be other mechanisms for stereoscopic tilt perception, or further processing steps in the use of orientation disparity, which are anisotropic in their mode of action.
水平视差的垂直梯度比水平梯度更容易被感知。如果方向视差（同一条线在两只眼睛视图中的方向差异）是用于确定倾斜的线索之一，那么这一点就可以得到解释，因为垂直梯度的方向视差通常更大。我们在此表明，即使对于水平和垂直梯度包含同等强烈方向视差线索的立体图，倾斜感知中也存在显著的各向异性。这意味着在立体倾斜感知中必定存在其他机制，或者在方向视差的使用中存在进一步的处理步骤，这些机制或步骤在其作用方式上是各向异性的。
