Spatial Bias In Visual Working Memory

Human visual system can process all properties of a visual object. Visual object properties can be divided into two major categories of surface characteristics and spatio-temporal properties, from the perspective of Neurophysiology, surface feature information and location information encoded by the dorsal and ventral pathways for storage. Studies have shown that, although the separation of the two types of information confirmed by the behavioral and physiological evidence, but the surface characteristics of the object of the binding information and location information is a fundamental problem in cognitive processes, because the surface characteristics of information related to the object’s identity and location information related to the coordinates of the object, once the surface characteristics and location information for bindings it means "where the object." Based on most of the research is to explore the binding process, or operation pay attention to factors such as type of load and surface features, but few studies explore relationship between surface feature information and location information, Visual information on surface properties of location information in working memory effect should be heeded.We have been using a change detection task (CDT), is an "all or nothing" inspection tasks. Although CDT involves location information potentially, it is mainly to distinguish surface features, therefore new paradigm need to be used in the study not only prominent surface feature information but can highlight of location information. Whole Report (WR) is the most ideal way. WR method was used, participants need to clearly remember the surface feature information and location information, and so that can get informations what CDT covered. More importantly, WR highlights the location informations of the visual objects, which come out spatial differences. From WR. we can get more comprehensive informations from its data than the CDT.This study used a combination of CDT and WR, collecting a large amount of data to analyse the position and surface feature information in visual working memory, particularly tested in visual working memory spatial position of the existence of bias.In Experiment 1, we use the standard CDT and WR to find spatial bias in visual working memory respectively. Both horizontal and vertical spatial bias are found under two paradigms, and are located in the left field of vision and vision. Showed that needs outside explicit to memory object surface information and within hidden memory object location information of changes awareness paradigm in the, was try is easy by within hidden of location information guide, on up field of vision and left field of vision of memory object performance high; and for needs outside explicit to memory object surface information and location information of all report method,, was try also can on up field of vision and left field of vision of memory object has better of memory scores. Therefore, whether location information is explicit, was tested in memory stimulation with a spatial location, stable focus in vision and left.Experiment 2 is the same with Experiment 1, which participants are also required to perform the standard CDT and lateralization WR. It attempts to discuss whether the spatial bias is influenced by the more explicitly reinforced spatial informations. CDT finds that the spatial bias exists on visual working memory, and is located in the left field of vision and in the up field of vision. In WR, which the one-sided view of the load is up to 6 memory objects and outstanding location information clearly strengthened, appears only in the vertical direction with spatial bias effects. It is characterized by the same memory performance of the left field and right field of vision, but the up field of vision is better than the down field of vision. Results show the following:unilateral position when memory project, participants likely will damage the spatial bias effect.In Experiment 3 is the same with Experiment 2, which also using standard CDT and quadrants WR. It attempts to explore the role of spatial effect in the four quadrants furtherly. Six objects used in WR are displayed at random in two quadrants, which mean only 3 objects at each quadrant. This further enhanced spatial clues, examine the performance of each quadrant. It was found that no spatial location bias effect. And CDT which acts as baseline criteria appears in the upper horizon of space location advantages.