van Bogaert Eric A, Ooi Teng Leng, He Zijiang J
Department of Psychological and Brain Sciences, University of Louisville, Louisville, KY 40492, USA.
Perception. 2008;37(8):1197-215. doi: 10.1068/p5986.
Boundary contours are important for representing binocular surfaces, including those in binocular rivalry. Ooi and He (2006, Perception 35 581-603) showed that a half-image with a boundary contour defined by abutting gratings predominates in binocular rivalry. We investigated the monocular-boundary-contour mechanism using Kanizsa square-like rivalry displays. In experiment 1, the left half-image had a vertical illusory contour on the right edge while the right half-image had a vertical illusory contour on the left edge. The Kanizsa elements (discs and pacmen) were filled with a 135 degree grating and placed on a 45 degree-grating background. When fused, observers experienced a strong predominance for perceiving an illusory rectangle in front of four discs. But this percept was replaced by robust rivalry alternations when the stimulus was manipulated by (i) switching the half-images between eyes, (ii)relocating the pacmen in each half-image to form horizontal illusory contours, or (iii) placing the pacmen diagonally (thus eliminating each monocular illusory contour). Such robust rivalry alternations were similar to those experienced when a 135 degree-grating disc was in rivalry with a 135 degree-grating pacman alone on the 45 degree-grating background (experiment 2). Experiment 3 showed that the relatively stable illusory-rectangle percept in experiment 1 is affected by the alignment of the images in the two eyes, in a manner consistent with adherence to the occlusion constraint in binocular surface formation.
边界轮廓对于呈现双眼视觉表面非常重要，包括双眼竞争中的那些表面。Ooi和He（2006年，《感知》35卷，581 - 603页）表明，由邻接光栅定义边界轮廓的半幅图像在双眼竞争中占主导地位。我们使用类似卡尼兹三角的竞争显示来研究单眼边界轮廓机制。在实验1中，左半幅图像在右边缘有一条垂直的错觉轮廓，而右半幅图像在左边缘有一条垂直的错觉轮廓。卡尼兹元素（圆盘和吃豆人形状）填充有135度的光栅，并放置在45度光栅的背景上。当融合时，观察者强烈倾向于感知到四个圆盘前面有一个错觉矩形。但是当通过以下方式操作刺激时，这种感知被强烈的竞争交替所取代：（i）在两眼之间切换半幅图像，（ii）在每个半幅图像中重新定位吃豆人形状以形成水平错觉轮廓，或者（iii）将吃豆人形状对角放置（从而消除每个单眼错觉轮廓）。这种强烈的竞争交替类似于当一个135度光栅圆盘与单独在45度光栅背景上的135度光栅吃豆人形状竞争时所体验到的情况（实验2）。实验3表明，实验1中相对稳定的错觉矩形感知受到两眼图像对齐的影响，其方式与在双眼表面形成中遵循遮挡约束一致。
