National Cheng Kung University, Taiwan.
J Exp Psychol Hum Percept Perform. 2011 Dec;37(6):1708-28. doi: 10.1037/a0024257. Epub 2011 Jul 18.
Change detection requires perceptual comparison and decision processes on different features of multiattribute objects. How relative salience between two feature-changes influences the processes has not been addressed. This study used the systems factorial technology to investigate the processes when detecting changes in a Gabor patch with visual inputs from orientation and spatial frequency channels. Two feature-changes were equally salient in Experiment 1, but a frequency-change was more salient than an orientation-change in Experiment 2. Results showed that all four observers adopted parallel self-terminating processing with limited- to unlimited-capacity processing in Experiment 1. In Experiment 2, one observer used parallel self-terminating processing with unlimited-capacity processing, and the others adopted serial self-terminating processing with limited- to unlimited-capacity processing to detect changes. Postexperimental interview revealed that subjective utility of feature information underlay the adoption of a decision strategy. These results highlight that observers alter decision strategies in change detection depending on the relative saliency in change signals, with relative saliency being determined by both physical salience and subjective weight of feature information. When relative salience exists, individual differences in the process characteristics emerge.
变化检测需要对多属性对象的不同特征进行感知比较和决策过程。两个特征变化之间的相对显著程度如何影响这一过程尚未得到解决。本研究使用系统因素技术，研究了当来自方位和空间频率通道的视觉输入检测到具有视觉输入的 Gabor 补丁的变化时，这一过程是如何进行的。在实验 1 中，两个特征变化同样显著，但在实验 2 中，频率变化比方位变化更显著。结果表明，在实验 1 中，所有四个观察者都采用了平行的自终止处理，处理能力有限到无限。在实验 2 中，一个观察者采用了平行的自终止处理，具有无限的处理能力，而其他观察者采用了串行的自终止处理，具有有限到无限的处理能力，以检测变化。实验后的访谈显示，特征信息的主观效用是决定采用决策策略的基础。这些结果强调，观察者根据变化信号中的相对显著程度改变变化检测中的决策策略，而相对显著程度取决于特征信息的物理显著程度和主观权重。当相对显著程度存在时，个体在过程特征上的差异就会显现出来。
