Smith M E, Guster K
Department of Psychology, Texas A and M University, College Station.
Electroencephalogr Clin Neurophysiol. 1993 May;86(5):335-43. doi: 10.1016/0013-4694(93)90046-x.
Task manipulations and a subtractive analytic strategy were combined to decompose the positive-going amplitude shift of the event-related potential (ERP) that is elicited by previously studied words during recognition memory testing. Target stimuli elicited a robust posterior P3b subcomponent, but this effect is shown to be independent of the effects of prior study. Two study-related subcomponents were also identified. The earlier study effect reached peak amplitude about 400 msec after word onset and was elicited by repeated words regardless of whether the task required retrieval of information from secondary memory. This effect might reflect a repetition-related decline in the amplitude of the N400 component. The other study-related effect reached peak amplitude around 600 msec post-stimulus onset. This later effect overlapped temporally with the P3b, but it was not related to targetness. Rather, it was specifically related to task conditions that required retrieval from secondary memory. The identification of this third effect helps to clarify the functional significance of the ERPs observed during recognition memory testing.
任务操作和减法分析策略相结合，以分解在再认记忆测试中由先前学习过的单词引发的事件相关电位（ERP）的正向幅度变化。目标刺激引发了一个强大的后部P3b子成分，但该效应被证明与先前学习的效应无关。还确定了两个与学习相关的子成分。较早的学习效应在单词呈现后约400毫秒达到峰值幅度，并且由重复单词引发，无论任务是否需要从二级记忆中检索信息。这种效应可能反映了与重复相关的N400成分幅度下降。另一个与学习相关的效应在刺激开始后约600毫秒达到峰值幅度。这个较晚的效应在时间上与P3b重叠，但它与目标性无关。相反，它特别与需要从二级记忆中检索的任务条件相关。这第三种效应的确定有助于阐明在再认记忆测试中观察到的ERP的功能意义。
