Treisman A
University of California, Berkeley.
J Exp Psychol Hum Percept Perform. 1991 Aug;17(3):652-76. doi: 10.1037//0096-1523.17.3.652.
Three experiments test the claim that conjunction search is difficult only because the target resembles each distractor, whereas the distractors are highly discriminable from each other. The results show that when similarity is controlled, there is an additional difficulty created by the need to conjoin features. In addition, a target with standard values (blue and vertical) is found more easily than targets with nonstandard values (e.g., violet and tilted). Similarity may result in shared components in the functional codes that represent the targets and the distractors. A hypothesis that is based on coarse coding of features values relates the difficulty of feature search with nonstandard targets to problems in coding conjunctions of features within dimensions. Consistent with this account, illusory targets are reported not only in the usual conjunction displays but also in displays containing different features that may share the same underlying components.
三项实验检验了这样一种说法，即联合搜索困难仅仅是因为目标与每个干扰项相似，而干扰项之间则具有高度可区分性。结果表明，当相似度得到控制时，特征联合的需求会带来额外的困难。此外，具有标准值（蓝色和垂直）的目标比具有非标准值（例如，紫色和倾斜）的目标更容易被找到。相似度可能会导致在表示目标和干扰项的功能代码中出现共享组件。一个基于特征值粗略编码的假设将非标准目标的特征搜索困难与维度内特征联合编码中的问题联系起来。与此观点一致的是，不仅在通常的联合显示中会报告虚幻目标，在包含可能共享相同潜在组件的不同特征的显示中也会报告虚幻目标。
