Hariharan-Vilupuru Srividhya, Bedell Harold E
College of Optometry, University of Houston, TX 77204-6052, USA.
Vision Res. 2009 Jan;49(2):190-201. doi: 10.1016/j.visres.2008.10.009. Epub 2008 Dec 2.
The proposed influence of objects that are visible to both eyes on the perceived direction of an object that is seen by only one eye is known as the "capture of binocular visual direction". The purpose of this study was to evaluate whether stereoscopic depth perception is necessary for the "capture of binocular visual direction" to occur. In one pair of experiments, perceived alignment between two nearby monocular lines changed systematically with the magnitude and direction of horizontal but not vertical disparity. In four of the five observers, the effect of horizontal disparity on perceived alignment depended on which eye viewed the monocular lines. In additional experiments, the perceived alignment between the monocular lines changed systematically with the magnitude and direction of both horizontal and vertical disparities when the monocular line separation was increased from 1.1 degrees to 3.3 degrees . These results indicate that binocular capture depends on the perceived depth that results from horizontal retinal image disparity as well as allelotropia, or the averaging of local-sign information. Our data suggest that, during averaging, different weights are afforded to the local-sign information in the two eyes, depending on whether the separation between binocularly viewed targets is horizontal or vertical.
双眼均可见的物体对仅单眼所见物体的感知方向的假定影响被称为“双眼视觉方向捕获”。本研究的目的是评估立体深度感知对于“双眼视觉方向捕获”的发生是否必要。在一组实验中，两条相邻单眼线之间的感知对齐随着水平视差而非垂直视差的大小和方向而系统地变化。在五名观察者中的四名中，水平视差对感知对齐的影响取决于哪只眼睛观察单眼线。在额外的实验中，当单眼线间距从1.1度增加到3.3度时，单眼线之间的感知对齐随着水平和垂直视差的大小和方向而系统地变化。这些结果表明，双眼捕获取决于由水平视网膜图像视差以及等位性眼偏差（或局部信号信息的平均）所产生的感知深度。我们的数据表明，在平均过程中，根据双眼观察目标之间的间隔是水平还是垂直，给予两眼局部信号信息的权重不同。
