Relation among perceptual, cognitive and emotional representations

通过一系列实验确定了透明度感知对颜色对比度和亮度对比度的依赖关系。结果表明，颜色和亮度对比在控制感知透明度的方式和强度上是等效的，背景条件对感知透明度的影响很大。透明度的感知发生在60-120毫秒的时间尺度上：感知透明度所需的最小曝光时间对于颜色变化的图案略慢于亮度变化的图案。这些结果表明，透明度的感知并不总是受到透明度物理的约束，而是主观地取决于图像区域的亮度和/或颜色所定义的对比度关系。对透明度的感知可能是一种全球现象，其属性可以用填充过程来解释。从立体角度看，恒定的差异梯度会产生斜面的感觉。通过对中任务，研究了视角线索和形状在决定立体倾斜知觉和倾斜轴各向异性中的构形效应。任务包括判断三条不同差异线的表观共面性。结果表明，共平面的估计遵循韦伯定律。发现表面轮廓的构形特性有两种不同的影响。一是视差梯度和透视梯度的相互作用，与形状信息相关联。另一种是对地面表面的感知，区别于对物体表面的感知。后一种效应表现为斜轴各向异性。我们认为这两种效应可能反映了双眼和单眼线索对深度信息的不同整合过程。

A series of experiments was carried out to determine the dependency of the perception of transparency on color contrast and luminance contrast. It was shown that color and luminance contrasts were equivalent in their ways and strength in controlling the perceptual transparency, and that the background condition strongly affected the perceptual transparency. The perception of transparency took place over time scale of 60-120 msec : the minimum exposure duration required for the perception of transparency was slightly slower for the color-varying patterns than for the luminance-varying patterns. These results indicate that the perception of transparency cannot be always constrained by the physics of transparency but arises subjectively depending on the contrast relation defined by luminance and/or color in an image region. The perception of transparency may be a global phenomenon, whose properties can be accounted for in terms of filling-in process.Stereoscopically, constant gradients of disparities give rise to the perception of slanted planes. Four experiments were conducted to examine the slant responses to disparity gradients and the configural effects of perspective cues and shape in determining stereoscopic slant perception and slant axis anisotropy by using an alignment task. Tasks included judging the apparent coplanarity of three lines with different disparities. The result showed that the estimation of coplanarity followed Weber's law. It was found that configural properties of surface contours had two distinctive effects. One is the interaction between disparity gradient and perspective gradient, associating with shape information. The other is the perception of a surface of ground, distinguished from the perception of an object surface. The latter effect showed slant axis anisotropy. We propose that the two effects may reflect different integration processes of information from binocular and monocular cues to depth.