Gerardin Peggy, Roud Philippe, Süsstrunk Sabine, Knoblauch Kenneth
Laboratory for Audiovisual Communications, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland.
Vis Neurosci. 2006 May-Aug;23(3-4):591-6. doi: 10.1017/S0952523806233352.
We tested whether motion and configural complexity affect perceived transparency. A series of five coherent chromatic transformations in color space was applied across a figure: translation, convergence, shear, divergence and rotation. The stimuli consisted of a bipartite or a checkerboard configuration (10 x 10 degrees), with a central static or moving overlay (5 x 5 degrees). Three different luminance conditions (the plane of chromatic transformation oriented toward higher, lower, or equal luminances) were also tested for each of three modulation depths. For each stimulus, the observer judged whether the overlay appeared transparent or not. The main results indicated an interaction between the type of chromatic transformation and stimulus motion and complexity. For example, convergences are judged to appear transparent significantly more often when motion is added for bipartite configurations, or when they are generated in a checkerboard configuration. Surprisingly, shears that have been reported to appear opaque, are more frequently reported to appear transparent with short vector lengths and when combined with motion. Other transformations are also affected by motion, although the effectiveness of figural complexity on transparency seems to depend on both the type of color shifts and the presence of motion. The results indicate that adding motion and stimulus complexity are not necessarily neutral with respect to the chromatic shifts evoking transparency. Thus, studies that have used motion to enhance transparency may yield different results about the color shifts supporting transparency perception from those that did not. The same might be supposed for stimulus complexity under some conditions.
我们测试了运动和构型复杂性是否会影响感知透明度。在一个图形上应用了一系列在颜色空间中的五个连贯的颜色变换：平移、汇聚、剪切、发散和旋转。刺激物由二分图形或棋盘格构型（10×10度）组成，带有一个中央静态或动态覆盖物（5×5度）。对于三种调制深度中的每一种，还测试了三种不同的亮度条件（颜色变换平面朝向更高、更低或相等的亮度）。对于每个刺激物，观察者判断覆盖物是否看起来是透明的。主要结果表明颜色变换类型与刺激物运动和复杂性之间存在相互作用。例如，对于二分图形构型添加运动时，或者当它们在棋盘格构型中生成时，汇聚被判断为明显更常看起来是透明的。令人惊讶的是，据报道看起来不透明的剪切，在向量长度较短且与运动结合时，更常被报告为看起来是透明的。其他变换也受运动影响，尽管图形复杂性对透明度的影响似乎取决于颜色变化的类型和运动的存在。结果表明，添加运动和刺激物复杂性对于引发透明度的颜色变化不一定是中性的。因此，使用运动来增强透明度的研究可能会在支持透明度感知的颜色变化方面产生与未使用运动的研究不同的结果。在某些条件下，对于刺激物复杂性也可能如此。
