Friedman-Hill S, Wolfe J M
Center for Neuroscience, University of California, Davis, USA.
J Exp Psychol Hum Percept Perform. 1995 Jun;21(3):531-51. doi: 10.1037//0096-1523.21.3.531.
Visual search tasks in which participants searched for an odd element in a subset of items were investigated. Participants searched for an item of odd orientation in the red subset. The target was a red line of X degree, distractors were green lines of X degree and red lines of Y degree. The orientations, X and Y, changed on every trial. In this task, orientation information was useful only after color had been used to select the relevant subset. Results show that response time (RT) and error data were different from standard color X orientation conjunction searches (Experiment 1). RT x Set Size functions had slopes near 0 ms per item (Experiment 2). The selection of the subset appeared to take 200-300 ms (Experiments 2 and 3). Subset selection was based on properties of the relevant subset, not the irrelevant subset (Experiment 4). It was more difficult (perhaps impossible) to select a subset defined by 2 colors (Experiment 5). Random variation in an irrelevant dimension did not disrupt subset search (Experiment 6).
研究了参与者在一组项目中搜索奇数元素的视觉搜索任务。参与者在红色子集中搜索方向不同的项目。目标是X度的红线，干扰项是X度的绿线和Y度的红线。每次试验中，X和Y的方向都会改变。在这项任务中，方向信息只有在颜色被用来选择相关子集之后才有用。结果表明，反应时间（RT）和错误数据与标准颜色×方向联合搜索不同（实验1）。RT×集合大小函数的斜率接近每个项目0毫秒（实验2）。子集的选择似乎需要200 - 300毫秒（实验2和3）。子集选择基于相关子集的属性，而非不相关子集的属性（实验4）。选择由两种颜色定义的子集更困难（可能是不可能的）（实验5）。无关维度中的随机变化不会干扰子集搜索（实验6）。
