Competitive Semantic Memory Retrieval: Temporal Dynamics Revealed by Event-Related Potentials.
Competitive Semantic Memory Retrieval: Temporal Dynamics Revealed by Event-Related Potentials.
复制标题
DOI：
10.1371/journal.pone.0150091
复制
发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Johansson M
中科院分区：
文献类型：
--
作者：
Hellerstedt R;Johansson M
当记忆与一个共同的提取线索相关时，它们会为提取而竞争。先前的研究表明，目标记忆的提取可能会导致随后的提取诱导遗忘（RIF）的当前不相关的竞争记忆。在本研究中，我们调查了竞争性语义提取的时间过程，并探讨了RIF的神经认知机制。我们通过研究这种记忆现象的一个关键方面，即它在多大程度上依赖于成功检索目标记忆，对比了RIF的两种理论解释。参与者首先研究了类别范例词对（例如水果-苹果）。接下来，我们记录了参与者执行竞争性语义线索回忆任务时大脑活动的电生理测量。在这项任务中，参与者被提供了研究的类别，但他们被指示检索其他未研究的样本（例如Fruit-Ma__？）。我们研究了事件相关电位（ERP）检索成功的相关性，通过比较成功和失败的检索试验的ERP。为了将连续检索尝试的ERP相关性与检索成功的ERP相关性分离出来，我们包括了一个不可能检索的条件，带有不完整的词干线索（Drinks-Wy__），并将其与非检索呈现基线条件（职业-牙医）进行了比较。在实验的最后阶段，测试了参与者对所有研究样本的记忆。两者合计，行为的结果表明，RIF是独立的目标检索。除了研究RIF的机制外，本研究还通过分离提取尝试和提取成功的ERP相关因素来阐明语义线索回忆的时间动态。ERP结果显示，检索尝试反映在一个后期的负，可能表明建设的候选人完成词干线索和检索监测，而检索成功反映在一个正面的慢波。
Memories compete for retrieval when they are related to a common retrieval cue. Previous research has shown that retrieval of a target memory may lead to subsequent retrieval-induced forgetting (RIF) of currently irrelevant competing memories. In the present study, we investigated the time course of competitive semantic retrieval and examined the neurocognitive mechanisms underlying RIF. We contrasted two theoretical accounts of RIF by examining a critical aspect of this memory phenomenon, namely the extent to which it depends on successful retrieval of the target memory. Participants first studied category-exemplar word-pairs (e.g. Fruit—Apple). Next, we recorded electrophysiological measures of brain activity while the participants performed a competitive semantic cued-recall task. In this task, the participants were provided with the studied categories but they were instructed to retrieve other unstudied exemplars (e.g. Fruit—Ma__?). We investigated the event-related potential (ERP) correlates of retrieval success by comparing ERPs from successful and failed retrieval trials. To isolate the ERP correlates of continuous retrieval attempts from the ERP correlates of retrieval success, we included an impossible retrieval condition, with incompletable word-stem cues (Drinks—Wy__) and compared it with a non-retrieval presentation baseline condition (Occupation—Dentist). The participants’ memory for all the studied exemplars was tested in the final phase of the experiment. Taken together, the behavioural results suggest that RIF is independent of target retrieval. Beyond investigating the mechanisms underlying RIF, the present study also elucidates the temporal dynamics of semantic cued-recall by isolating the ERP correlates of retrieval attempt and retrieval success. The ERP results revealed that retrieval attempt is reflected in a late posterior negativity, possibly indicating construction of candidates for completing the word-stem cue and retrieval monitoring whereas retrieval success was reflected in an anterior positive slow wave.