Shimono Koichi, Tam Wa James, Asakura Nobuhiko, Ohmi Masao
Department of Marine Technology, Tokyo University of Marine Science and Technology, Ettchujima 2-1-6, Koto-ku, Tokyo, Japan.
Vision Res. 2005 Sep;45(20):2631-41. doi: 10.1016/j.visres.2005.05.003.
We examined the phenomenon in which two physically aligned monocular stimuli appear to be non-collinear when each of them is located in binocular regions that are at different depth planes. Using monocular bars embedded in binocular random-dot areas that are at different depths, we manipulated properties of the binocular areas and examined their effect on the perceived direction and depth of the monocular stimuli. Results showed that (1) the relative visual direction and perceived depth of the monocular bars depended on the binocular disparity and the dot density of the binocular areas, and (2) the visual direction, but not the depth, depended on the width of the binocular regions. These results are consistent with the hypothesis that monocular stimuli are treated by the visual system as binocular stimuli that have acquired the properties of their binocular surrounds. Moreover, partial correlation analysis suggests that the visual system utilizes both the disparity information of the binocular areas and the perceived depth of the monocular bars in determining the relative visual direction of the bars.
当两个物理对齐的单眼刺激分别位于不同深度平面的双眼区域时，它们看起来并非共线。我们使用嵌入在不同深度的双眼随机点区域中的单眼棒，操纵双眼区域的属性，并研究它们对单眼刺激的感知方向和深度的影响。结果表明：（1）单眼棒的相对视觉方向和感知深度取决于双眼视差和双眼区域的点密度；（2）视觉方向取决于双眼区域的宽度，而深度则不然。这些结果与以下假设一致：视觉系统将单眼刺激视为已获得其双眼周围环境属性的双眼刺激。此外，偏相关分析表明，视觉系统在确定棒的相对视觉方向时，既利用了双眼区域的视差信息，也利用了单眼棒的感知深度。
