EVENT-RELATED BRAIN POTENTIALS DISSOCIATE REPETITION EFFECTS OF HIGH-FREQUENCY AND LOW-FREQUENCY WORDS
EVENT-RELATED BRAIN POTENTIALS DISSOCIATE REPETITION EFFECTS OF HIGH-FREQUENCY AND LOW-FREQUENCY WORDS
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DOI：
10.3758/bf03197126
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发表时间：
1990-07-01
影响因子：
2.4
通讯作者：
RUGG, MD
中科院分区：
文献类型：
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作者：
RUGG, MD
事件相关脑电位（ERPs）记录，而受试者检测到非词穿插在序列的话出现频率高或低。在第一阶段，一部分单词在六个中间项目后重复。在第二阶段，在大约15分钟的休息后，单词要么是前一阶段中出现的项目的重复，要么是新的。不重复的低频词诱发更大的N400成分比高频项目。在第一阶段，这种效果与重复相互作用，这样，没有频率的影响，观察到N400诱发的重复工作。此外，后500毫秒的潜伏期区域的ERP表现出大量的重复效应的低频字，但不区分重复和重复的高频字。在第二阶段，由“旧”和“新”低频词诱发的ERP在任何潜伏期区域都没有差异，而由旧低频词和新低频词诱发的ERP仅在500毫秒后不同。频率和重复的交互作用表明，这些变量共同作用于多个位点在一个词的处理。后500毫秒的低频词重复效应的特异性可能反映了一个过程，对词的内部和外部实验熟悉度之间的差异作出反应。
Event-related brain potentials (ERPs) were recorded while subjects detected nonwords interspersed among sequences of words of high or low frequency of occurrence. In Phase 1, a proportion of the words were repeated after six intervening items. In Phase 2, which followed after a break of approximately 15 min, the words were either repeats of items presented in the previous phase or new. Unrepeated low-frequency words evoked larger N400 components than did high-frequency items. In Phase 1, this effect interacted with repetition, such that no frequency effects were observed on N400s evoked by repeated works. In addition, the post-500-msec latency region of the ERPs exhibited a substantial repetition effect for low-frequency words, but did not differentiate unrepeated and repeated high-frequency words. In Phase 2, ERPs evoked by "old" and "new" low-frequency words did not differ in any latency region, while those evoked by old and new low-frequency words differed only after 500 msec. The interactive effects of frequency and repetition suggest that these variables act jointly at multiple loci during the processing of a word. The specificity of the post-500-msec repetition effect for low-frequency words may reflect a process responsive to a discrepancy between words'' intra and extraexperimental familiarity.