Event-related potential correlates of item and source memory strength.
Event-related potential correlates of item and source memory strength.
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DOI：
10.1016/j.brainres.2009.12.074
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发表时间：
2010-03-04
期刊：
影响因子：
2.9
通讯作者：
Gonsalves, Brian D.
中科院分区：
文献类型：
--
作者：
Woroch, Brion;Gonsalves, Brian D.
再认记忆的事件相关电位（ERP）研究表明，项目再认和源记忆之间存在分离，其中项目再认与中额叶FN 400成分相关，该成分随项目记忆强度而连续变化，而源记忆与晚期顶叶效应（LPC）相关。目前有争论是否源记忆可以变化沿着记忆强度的连续或一个阈值过程。LPC已被证明是一般敏感的正确与不正确的源判断，但不同水平的“源强度”沿着单一维度的源证据尚未进行测试。当前的实验有参与者编码新的视觉对象在两个不同的任务背景之一，通过执行一个概念或知觉判断的对象。在随后的记忆测试中，参与者在4点置信度量表上做出旧/新的决定，然后进行源记忆置信度判断，其中他们表示他们对编码时使用对象执行的任务的信心。从记忆测试的ERPs检查项目和源记忆强度的电生理相关性。项目记忆与300- 500 ms时间窗的差异相关，与FN 400的时间一致。LPC的幅度的差异之间观察到正确和不正确的源的决定，与以前的研究结果一致。比较低和高置信度的源决策也显示出差异，这表明LPC也是敏感的源记忆的强度的变化。
Event-related potential (ERP) studies of recognition memory have shown dissociations between item recognition and source memory, wherein item recognition is associated with the mid-frontal FN400 component, which varies continuously with item memory strength, while source memory is associated with the late parietal effect (LPC). There is current debate about whether source memory can vary along a continuum of memory strength or is a threshold process. The LPC has been shown to be generally sensitive to correct versus incorrect source judgments, but varying levels of “source strength” along a single dimension of source evidence have not been tested. The current experiment had participants encode novel visual objects in one of two different task contexts by performing either a conceptual or perceptual judgment about the object. On a subsequent memory test, participants made an old/new decision on a 4-point confidence scale followed by a source memory confidence judgment, in which they indicated their confidence about which task they had performed with the object at encoding. ERPs from the memory test were examined for electrophysiological correlates of both item and source memory strength. Item memory was associated with differences in the 300–500ms time window, consistent with the timing of the FN400. Differences in the amplitude of the LPC were observed between correct and incorrect source decisions, consistent with previous findings. Comparing low and high confidence source decisions also revealed differences, suggesting that the LPC is also sensitive to variations in the strength of source memory.
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DOI：
10.1523/jneurosci.3456-08.2008
发表时间：
2008-10-15
期刊：
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子：
--
作者：
Kirwan CB;Wixted JT;Squire LR
通讯作者：
Squire LR
影响因子：
2.4
作者：
Donaldson, W
通讯作者：
Donaldson, W
DOI：
10.1037/0278-7393.28.3.503
发表时间：
2002-05-01
影响因子：
2.6
作者：
Hicks, JL;Marsh, RL;Ritschel, L
通讯作者：
Ritschel, L
影响因子：
5.4
作者：
MANDLER, G
通讯作者：
MANDLER, G
影响因子：
3
作者：
Wilding, EL
通讯作者：
Wilding, EL