Chen Siyi, Glasauer Stefan, Müller Hermann J, Conci Markus
General and Experimental Psychology, Department of Psychology, Ludwig-Maximilians-Universität München.
Center for Sensorimotor Research, Department of Neurology, Ludwig- Maximilians-Universität München.
J Exp Psychol Hum Percept Perform. 2018 Sep;44(9):1399-1413. doi: 10.1037/xhp0000540. Epub 2018 Apr 30.
To explore mechanisms of object integration, the present experiments examined how completion of illusory contours and surfaces modulates the sensitivity of localizing a target probe. Observers had to judge whether a briefly presented dot probe was located inside or outside the region demarcated by inducer elements that grouped to form variants of an illusory, Kanizsa-type figure. From the resulting psychometric functions, we determined observers' discrimination thresholds as a sensitivity measure. Experiment 1 showed that sensitivity was systematically modulated by the amount of surface and contour completion afforded by a given configuration. Experiments 2 and 3 presented stimulus variants that induced an (occluded) object without clearly defined bounding contours, which gave rise to a relative sensitivity increase for surface variations on their own. Experiments 4 and 5 were performed to rule out that these performance modulations were simply attributable to variable distances between critical local inducers or to costs in processing an interrupted contour. Collectively, the findings provide evidence for a dissociation between surface and contour processing, supporting a model of object integration in which completion is instantiated by feedforward processing that independently renders surface filling-in and contour interpolation and a feedback loop that integrates these outputs into a complete whole. (PsycINFO Database Record
为了探究物体整合的机制，本实验研究了虚幻轮廓和表面的完成如何调节定位目标探针的敏感性。观察者必须判断一个短暂呈现的点探针是位于诱导元素划定的区域内还是区域外，这些诱导元素组合形成了虚幻的卡尼兹萨型图形的变体。根据得到的心理测量函数，我们确定了观察者的辨别阈值作为敏感性度量。实验1表明，敏感性受到给定配置所提供的表面和轮廓完成量的系统调节。实验2和3呈现了能诱导出一个（被遮挡的）没有清晰界定边界轮廓的物体的刺激变体，这本身就导致了对表面变化的相对敏感性增加。进行实验4和5是为了排除这些性能调节仅仅归因于关键局部诱导物之间的可变距离或处理中断轮廓的成本。总的来说，这些发现为表面和轮廓处理之间的分离提供了证据，支持了一种物体整合模型，其中完成是通过前馈处理实现的，前馈处理独立地进行表面填充和轮廓插值，以及一个将这些输出整合为一个完整整体的反馈回路。（PsycINFO数据库记录）
