Cohen A, Ivry R B
Department of Psychology, Indiana University, Bloomington 47405.
J Exp Psychol Hum Percept Perform. 1991 Nov;17(4):891-901. doi: 10.1037//0096-1523.17.4.891.
Four experiments used the visual search paradigm to examine feature integration mechanisms. Reaction time to determine the presence or absence of a conjunctive target is relatively fast and exhaustive for low-density displays. Search rate is slow and self-terminating for high-density displays. Density effects do not arise when the target is defined by a unique feature. Two mechanisms are proposed for feature integration. A fast mechanism integrates features on the basis of coarse location information coded with the initial registration of the features. This coarse location mechanism requires that display items be spaced apart. A second, slower mechanism is used when objects are clumped together. The 2-mechanism hypothesis provides a resolution to conflicting findings in the visual search and illusory-conjunction literature. A possible interpretation of the findings with a single guided search mechanism for feature integration is also discussed.
四项实验采用视觉搜索范式来检验特征整合机制。对于低密度显示，确定联合目标是否存在的反应时间相对较快且是彻底性的。对于高密度显示，搜索速率较慢且是自终止的。当目标由独特特征定义时，不会出现密度效应。针对特征整合提出了两种机制。一种快速机制基于与特征的初始登记一起编码的粗略位置信息来整合特征。这种粗略位置机制要求显示项目间隔开。当对象聚集在一起时，使用第二种较慢的机制。双机制假说为视觉搜索和错觉性结合文献中的矛盾发现提供了解决方案。还讨论了对具有单一引导搜索机制进行特征整合的研究结果的一种可能解释。
