This demo shows several kinds of phenomena of "visual disappearance" in which visual images created using Gestalt principles for grouping and segregation disappear as if erased in front of the observers' eyes. It is implemented to show the complete and incomplete image successively, which are presented for 3 s each. This sequence is repeated multiple times with an inter-trial resting period of 3 s. During this period, the stimulus image is replaced with a gray surface. The incompleteness means that Gestalt properties embedded in the original images are exacerbated by erasing some of their parts (see text for details). When one of the links is clicked, the demonstration will begin. The standard procedure is the same across all demonstrations. Try to fixate on a central cross when the original image is presented. Three seconds later, line segments, or areas composing the original image will be partially erased for 3 s. During both periods, maintain fixation on the same central cross without moving the eyes and blinking. Another important point is not to attend on specific parts or areas of the objects, but on the image as a whole. For improved results, head movement should be minimized, and, if possible, the head should be immobilized with a chinrest. These are very important in order to finish the task successively. When viewing images with a smaller screen than that I used (W 518.4 x H 324.0 mm), the viewing distance should be shortened.

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Demonstration 3 & 4