Otten L J, Rugg M D, Doyle M C
Institute for Experimental and Occupational Psychology, University of Groningen, The Netherlands.
Psychophysiology. 1993 Nov;30(6):559-71. doi: 10.1111/j.1469-8986.1993.tb02082.x.
Event-related potentials (ERPs) were recorded while subjects viewed visually presented words, some of which occurred twice. Each trial consisted of two colored letter strings, the requirement being to attend to and make a word/nonword discrimination for one of the strings. Attention was manipulated by color in Experiment 1, and color and a precue were used in Experiment 2. As in previous ERP studies of word repetition, a positive offset to repeated words developed when both first and second presentations were the focus of attention. In Experiment 2, ERPs showed evidence of positive-going repetition effects in all conditions in which at least one of the two presentations of the repeated word was attended. In the visual modality, the positive-going ERP repetition effect occurs only when at least one of the two presentations of a repeated item is the object of attention, which suggests that one or more of the processes reflected by the effect is capacity limited.
在受试者观看视觉呈现的单词时记录事件相关电位（ERP），其中一些单词会出现两次。每次试验由两个彩色字母串组成，要求受试者关注其中一个字符串并判断其是否为单词。在实验1中，通过颜色来操纵注意力，在实验2中则使用颜色和一个预提示。与之前关于单词重复的ERP研究一样，当第一次和第二次呈现都成为关注焦点时，对重复单词会产生一个正向偏移。在实验2中，ERP显示在重复单词的两次呈现中至少有一次被关注的所有条件下，都存在正向重复效应。在视觉通道中，正向ERP重复效应仅在重复项目的两次呈现中至少有一次成为关注对象时才会出现，这表明该效应所反映的一个或多个过程受到容量限制。
