Gold Jason M, Shubel Erin
Department of Psychological & Brain Sciences, Indiana University, Bloomington, IN 47405, USA.
J Vis. 2006 Mar 3;6(4):356-65. doi: 10.1167/6.4.5.
A constant problem faced by the visual system is the identification of partly occluded objects within the visual scene. Recent experiments have demonstrated that the visual system engages in a process of visual completion, where the hidden parts of objects are filled into the visual representation. Recent experiments have also suggested that there may be a time course to this completion process. Here, we examined the spatiotemporal properties of visual completion by having observers classify figures defined by either luminance-defined or illusory contours and then correlating their decisions with externally added spatiotemporal visual noise. This "response classification" technique allowed us to derive a spatiotemporal correlation map (a "classification movie") that revealed the locations used by observers at each point in space and time during the stimulus presentation. We found that observers gradually became more influenced by noise at locations corresponding to illusory contours across the first 175 ms of stimulus presentation. Our results are consistent with the idea that there is a time course to the completion process on the order of approximately 175 ms.
视觉系统面临的一个持续问题是在视觉场景中识别部分被遮挡的物体。最近的实验表明，视觉系统会参与视觉完形过程，即物体的隐藏部分会被填充到视觉表征中。最近的实验还表明，这个完形过程可能存在一个时间进程。在这里，我们通过让观察者对由亮度定义或错觉轮廓定义的图形进行分类，然后将他们的决策与外部添加的时空视觉噪声相关联，来研究视觉完形的时空特性。这种“反应分类”技术使我们能够得出一个时空相关图（一个“分类影片”），它揭示了在刺激呈现期间观察者在空间和时间的每个点所使用的位置。我们发现，在刺激呈现的前175毫秒内，观察者逐渐受到与错觉轮廓相对应位置处噪声的更大影响。我们的结果与这样一种观点一致，即完形过程存在一个大约175毫秒量级的时间进程。
