| Budget Amount *help |
¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
|
|---|
| Research Abstract |
(1) To study the integration of different visual features in dynamic situations, we investigated the integration of color and spatiotemporal location in visual working memory by using a modified version of the flicker paradigm. Inconsistent with the previous claims that we can store four to five object information simultaneously in visual working memory, it was extremely difficult to store the information of only three objects in a dynamic and multidimensional situation. These data strongly suggest that in dynamic situations involving objects' motion, we do not construct multiple object representations integrating multidimensional information. The results also showed that the difficulty in storage and transformation cannot be attributed to the lack of local motion signals, and that spatiotemporal predictability had some facilitatory effects on performance. Furthermore, in a task where the combination of shape and color is necessary, the availability of object representations where perc
… More
eptual features are integrated is quite low in the process of dynamic transformation and storage of visual information.
(2) Change blindness phenomenon suggests that visual short-term memory has severe capacity limit. To investigate what kind of visual information is stored in visual short-term memory, we conducted a change detection task with subjective contour figures. In a task where participants were asked to search the presence of shape change across blank periods, we have shown that even when the amount of physical figural change is equivalent, the search was more accurate when the changing objects contains subjective surface figures. Moreover, this effect occurs not at the level of subjective contours, but at the level of subjective surface representations.
(3) We conducted a series of experiments to examine whether an occluded object functions as a single object for the visual attention mechanism. In the previous study supporting this hypothesis, the effects of amodal completion and symmetry of objects were confounded. We examined whether the effect of amodal completion is obtained with asymmetric objects. The results revealed that the effects of amodal completion completely disappeared with the asymmetric objects. Less
|
