A neural signature of contextually mediated intentional forgetting.

A neural signature of contextually mediated intentional forgetting.
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DOI:
10.3758/s13423-016-1024-7
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发表时间:
2016-10
影响因子:
3.5
通讯作者:
Norman KA
Norman KA
中科院分区:
心理学2区
文献类型:
--
作者:
Manning JR;Hulbert JC;Williams J;Piloto L;Sahakyan L;Norman KA

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我们经历一件事的心理环境对我们如何组织我们对一件事的记忆(例如与其他事件有关)起着基本的作用,反过来,我们又如何在以后找回这些记忆。因为我们使用语境表征来检索与我们过去有关的信息,所以改变我们语境表征的过程可以增强或削弱我们检索特定记忆的能力。我们设计了一项功能磁共振成像(FMRI)实验,以检验这样一种假设,即人们可以通过改变与先前经历的事件相关的背景信息的心理表征来故意忘记这些事件。我们让人类参与者研究两个单词列表,在研究第二个单词列表之前,操纵他们是否被告知忘记(或记住)第一个单词列表。我们使用模式分类器跟踪反映与第一个列表相关的语境信息的神经模式,发现与语境变化的概念一致,在忘记指令之后,第一列表语境表征的激活程度低于记住指令。此外,这种背景变化的神经特征的大小与参与者后来回忆第一个列表中的项目的能力呈负相关。
The mental context in which we experience an event plays a fundamental role in how we organize our memories of an event (e.g. in relation to other events) and, in turn, how we retrieve those memories later. Because we use contextual representations to retrieve information pertaining to our past, processes that alter our representations of context can enhance or diminish our capacity to retrieve particular memories. We designed a functional magnetic resonance imaging (fMRI) experiment to test the hypothesis that people can intentionally forget previously experienced events by changing their mental representations of contextual information associated with those events. We had human participants study two lists of words, manipulating whether they were told to forget (or remember) the first list prior to studying the second list. We used pattern classifiers to track neural patterns that reflected contextual information associated with the first list and found that, consistent with the notion of contextual change, the activation of the first-list contextual representation was lower following a forget instruction than a remember instruction. Further, the magnitude of this neural signature of contextual change was negatively correlated with participants’ abilities to later recall items from the first list.
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