时间顺序记忆期间的对侧延迟活动。,Neuropsychologia

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时间顺序记忆期间的对侧延迟活动。
Neuropsychologia ( IF 2.0 ) Pub Date : 2019-03-25 , DOI: 10.1016/j.neuropsychologia.2019.03.012
Ulrich Pomper ₁ , Thomas Ditye ₂ , Ulrich Ansorge ₁

Affiliation

在日常生活中，我们经常需要记住短时间内视觉事件的时间顺序，例如，在理解他人的动作或看电影时。尽管关于视觉识别（VWM）的对象的身份和空间位置的神经机制的知识越来越多，但是关于大脑如何编码和保留时间序列信息的知识却鲜为人知。在这里，我们调查对侧延迟活动（CDA），与对象身份的VWM相关的经过充分研究的脑电图（EEG）组件，是否也反映了时间顺序的编码和保留。在两个独立的实验中，我们为参与者提供了四张或六张图像的序列，然后是一个1 s的保留期。参与者通过指示随后呈现的探针图像是最初显示在序列的前半部还是后半部来判断时间顺序。作为一项主要的新颖结果，我们报告了在出现序列的第一项之后就已经出现了对侧负向性，这种对立性在试验过程中随着每个呈现项的增加而增加，最多限制为四项。我们进一步观察到，在时间顺序任务中，CDA与在有关所呈现项目的空间位置的任务中获得的CDA没有差异。由于CDA的特征在不同的编码特征尺寸之间看起来非常相似，并且随着其他项目被编码而增加，因此我们建议此组件可能是各种VWM的一般特征。

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Contralateral delay activity during temporal order memory.

In everyday life, we constantly need to remember the temporal sequence of visual events over short periods of time, for example, when making sense of others' actions or watching a movie. While there is increasing knowledge available on neural mechanisms underlying visual working memory (VWM) regarding the identity and spatial location of objects, less is known about how the brain encodes and retains information on temporal sequences. Here, we investigate whether the contralateral-delay activity (CDA), a well-studied electroencephalographic (EEG) component associated with VWM of object identity, also reflects the encoding and retention of temporal order. In two independent experiments, we presented participants with a sequence of four or six images, followed by a 1 s retention period. Participants judged temporal order by indicating whether a subsequently presented probe image was originally displayed during the first or the second half of the sequence. As a main novel result, we report the emergence of a contralateral negativity already following the presentation of the first item of the sequence, which increases over the course of a trial with every presented item, up to a limit of four items. We further observed no differences in the CDA during the temporal-order task compared to one obtained during a task concerning the spatial location of the presented items. Since the characteristics of the CDA appear to be highly similar between different encoded feature dimensions and increases as additional items are being encoded, we suggest this component might be a general characteristic of various types of VWM.

更新日期：2019-03-25

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