项目突显方式对视觉搜索策略的影响

搜索策略是将视觉注意导引到目标最可能出现位置的直接认知控制。本研究采用眼动跟踪技术与视觉搜索时间——鼠标点击时间的分离技术，探讨计算机视觉界面不同项目突显方式下的搜索策略问题。结果表明：（1）有无项目突显方式、不同的突显有效性水平，被试采用了导向式和序列式两种不同的搜索策略；（2）被试采用导向式搜索策略时，被试在第一个感兴趣区域首注视点百分比小于58.3％，在视觉搜索过程中的注视点数量明显较小、扫视轨迹长度和注视时间明显较少；（3）被试采用序列式搜索策略时，被试在第一个感兴趣区域首注视点百分比大于58.3％，在视觉搜索过程中的注视点数量明显较多、扫视轨迹长度和注视时间明显较长；（4）采用导向式的视觉搜索策略能显著减少被试的视觉搜索时间，提高视觉搜索的绩效，但不能显著减少被试的鼠标点击时间；（5）因为视觉界面上突显的设置改变了用户的搜索策略，所以提高了视觉搜索绩效。

ITEM HIGHLIGHTING INFLUENCE ON VISUAL SEARCHING STRATEGIES Studies of Item Highlighting IN PAGE LAYOUT

Searching strategy is a direct cognitive control process that guides the visual focus to the target object. This study used eye tracking technique, visual searching time, and separation of mouse clicking time. The goal is to understand visual searching, searching strategies, and item highlighting. The conclusions are as follows: (1)In the process of searching item, participants employed different searching strategies, they used directive strategy when provided with item highlighting, used serial search strategy when not provided with item highlighting; (2) When participants employed directive strategy, the percent of the number of first fixation in the first area of interest was less than 58.3%, and when serial strategy was employed, the percent was more than 58.3%; (3)When directive strategy was employed in the process of searching, the number of fixation,scan track and fixation time were salience less than when serial strategy was employed. (4) Participants used directive strategy can salience shorten participants' visual search time, improve visual search performance , but can't shorten the time spending on mouse clicking; (5) Item highlighting changed the visual search strategy, and thus improve the visual search performance.