McOwan P W, Johnston A
Department of Psychology, University College London, UK.
Curr Biol. 1996 Oct 1;6(10):1343-6. doi: 10.1016/s0960-9822(02)70722-7.
What circumstance lead to the perception of global motion transparency? it has been shown that, in paired random dot displays, motion transparency can be abolished if the separation of the dot pairs is sufficiently small. Motion transparency has also been shown to be influenced by high level cognitive cues. Here, we report that the combination of two moving dot stimuli, which separately invoke a percept of transparent motion, gives rise to a non-transparent percept of local rotation. These stimuli were constructed using various different pattern elements, including luminance defined elements and contrast modulations. The results extend and support the view that high-level grouping of local measures of the velocity field can determine whether a motion transparency is perceived or not.
什么情况会导致对全局运动透明度的感知？研究表明，在配对随机点显示中，如果点对的间距足够小，运动透明度可以消除。运动透明度也已被证明受高级认知线索的影响。在此，我们报告，两个分别引发透明运动感知的移动点刺激的组合，会产生局部旋转的非透明感知。这些刺激是使用各种不同的图案元素构建的，包括亮度定义元素和对比度调制。结果扩展并支持了这样一种观点，即速度场局部测量的高级分组可以决定是否能感知到运动透明度。
