The "top-down" effects of grasping-form on simultaneous contrasts.

为了研究不同刺激条件下自上而下对同时对比的影响，我们通过操纵被试的态度和视觉感知经验来测量色调和亮度对比（MHCs和MBCs）的大小。首先，我们安排被试的实验素养，以识别色相/亮度对比和同化在科夫卡环型图案（条纹）感知中的差异。结果表明，当测试图（TF）宽于诱导图（IF）时，被试知道从“对比”到“同化”的转变，在条形TF / IF比例增加时，被试的mhc和MBCs发生了典型的转变。此外，受试者的实验素养被量身定制，以检查色调对比度与TF几何行模式相似性之间的关系（例如，红色IF上的灰色圆圈与绿色IF上的灰色正方形）。进一步的研究结果表明，被试对TF的图形相似度与mhc之间的显著关系的存在有着积极的反应，而被试对TF的图形相似度与mhc之间的关系非常熟悉。综上所述，被试所采取的自上而下（抓取）态度即使对同时对比等更外围或敏感的现象也会产生不同的影响。为了进一步阐明自上而下对同时对比的影响，我们需要使用更发达的实验条件进行更深入的研究。

To examine the top-down effects on simultaneous contrasts under various stimulus conditions, we measured the magnitudes of hue and brightness contrasts (MHCs and MBCs) by manipulating subjects' attitudes and experiences on visual perception. First, we arranged the subjects' experimental literacy to identify the difference between hue/brightness contrast and assimilation in the perception of Koffka-ring type patterns ("striped" patterns). Results revealed that the subjects, who knew the transition from "contrast" to "assimilation" when the test figure (TF) made wider than the inducing figure (IF), reported typical transition in the MHCs and MBCs under the increasing ratio of striped TF to IF.Furthermore, the subjects' experimental literacy was tailored to examine the relationship between the hue contrast and the similarity of TF's geometrical row-patterns (for instance, gray circle on red IF vs.gray square on green IF). Further results indicated that the subjects, who were well versed in the relationship between the TF's pattern and the hue contrast, positively responded to the existence of the significant relationship between the TF's figural similarity and the MHCs. In conclusion, the top-down (grasping) attitudes adopted by the subjects generate the different effect even on the more peripheral or sensitive phenomena such as simultaneous contrast. To further elaborate the top-down effects on simultaneous contrast, we need more intensive studies using more developed experimental conditions.