Dissociation of the electrophysiological correlates of familiarity strength and item repetition.
Dissociation of the electrophysiological correlates of familiarity strength and item repetition.
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DOI：
10.1016/j.brainres.2009.12.071
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发表时间：
2010-03-12
期刊：
影响因子：
2.9
通讯作者：
Rugg, Michael D.
中科院分区：
文献类型：
--
作者：
Yu, Sarah S.;Rugg, Michael D.
用事件相关电位(ERPs)研究了再认记忆测验项目(有生命和无生命物体的图片)的熟悉强度与熟悉度的事件相关电位(ERP)之间的关系，即额叶中段的旧/新效应。在修改的记忆/知道任务中，如果可以检索到研究演示文稿的任何细节，则受试者将项目批注为“已记住”，如果不能，则使用4分置信度量表(“有信心的旧”到“有信心的新”)来判断项目的旧/新状态。被研究的测试项目引出了前额中部的旧/新效应，这种效应随被试对引出项目的熟悉程度的不同而变化。因此，先前的研究发现，额叶中段效应是根据熟悉程度进行分级的，这并不是研究状态的混杂影响所致，正如已经提出的那样。被评为同样熟悉的已研究和未研究项目所诱发的事件相关电位的潜伏期范围与额叶中段新旧效应所占的潜伏期相同。此外，这种重复效应的头皮地形图与额中效应的头皮地形图有很大的不同。研究结果表明，在300-500ms的潜伏期内，再认记忆测试项目诱发的事件相关电位受项目熟悉度和内隐记忆过程的调节，内隐记忆过程独立于支持熟悉度驱动的再认判断的过程。
Event-related potentials (ERPs) were employed to investigate the relationship between the familiarity strength of recognition memory test items (pictures of animate and inanimate objects) and a putative ERP correlate of familiarity, the mid-frontal ‘old/new’ effect. A modified Remember/Know task was used in which subjects endorsed items as ‘remembered’ if any detail of the study presentation could be retrieved and, if not, judged the old/new status of the item using a 4-point confidence scale (‘confident old’ to ‘confident new’). Studied test items elicited a mid-frontal old/new effect that varied according to the rated familiarity of the eliciting item. Thus, prior findings that the mid-frontal effect is graded according to familiarity strength are not attributable to the confounding influence of study status, as has been suggested. ERPs elicited by studied and unstudied items that were rated equally familiar differed in the same latency range as that occupied by the mid-frontal old/new effect. Furthermore, the scalp topography of this repetition effect differed significantly from the topography of the mid-frontal effect. The findings suggest that ERPs elicited by recognition memory test items are modulated during the 300-500 ms latency range both by the familiarity strength of the item and, separately, by an implicit memory process that acts independently of the processes supporting familiarity-driven recognition judgments.
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