A Research On The Mechanical Of Closed Structure Material In Visual Search Procession

There are three important theories in visual search: feature integration theory, guided search theory and similarity theory. This paper shows the theories in details. Then point out that few previous researches with closed structure materials has been done. But closed structure materials has topological feature. That is to say closed structure materials will be first persecuted than other materials. So it will be more important to use to check out theories on visual search.Three experiments were conducted in order to study the closed structure materials process in visual search.In the first experiment, participants search for a conjunction target (size×closed structure or size×unclosed structure) and a simple target (closed structure or unclosed structure ) . Experiment shows that closed structure target always faster than unclosed structure target. When search for a simple task, it is a parallel search, but when search for a conjunction target, the search process is parallel search when target includes closed structure, but a serial process when target includes unclosed structure.In experiment 2, difficulty increases with increased similarity of targets to nontargets, the result is consistent with similarity theory. The search of target and nontarget with different structure be affected by similarity, so there are no search efficient when target and nontarget with different global structure.In experiment 3, participants were required to search one or more circles. Different directions opening circles defined the nontarget. The result shows reaction time decrease with increasing of the number of target, and perceptual grouping is based on feature, not location.