Göddertz Anna, Klatt Laura-Isabelle, Mertes Christine, Schneider Daniel
Leibniz-Research Centre for Working Environment and Human Factors, TU Dortmund, Dortmund, Germany.
Front Hum Neurosci. 2018 Oct 18;12:428. doi: 10.3389/fnhum.2018.00428. eCollection 2018.
Shifts of attention within working memory based on retroactive (retro-) cues were shown to facilitate performance in working memory tasks. Although posterior asymmetries in the EEG, such as the contralateral delay activity (CDA), have been used to study the active storage of lateralized working memory representations, results on the relation of such asymmetric effects to retro-cue benefits remain inconclusive. We recorded EEG in a retro-cue working memory task with lateralized items and a continuous performance response. Following either a selective or neutral retro-cue, participants adjusted the orientation of a central memory probe to the cued item. Selective retro-cues elicited an early posterior contralateral negativity (PCN), anterior directing attention negativity (ADAN) and a later modulation of CDA indicating that active storage was concentrated on the cued information. By dividing all trials into three within-condition performance quantiles, we could further show that high working memory accuracy was associated with a sustained increase of the CDA effect following the retro-cue. These results suggest that focusing resources on the active storage of relevant representations is an important factor regarding retro-cue benefits in working memory tasks.
基于回溯性（retro-）线索的工作记忆内注意力转移被证明有助于提高工作记忆任务的表现。尽管脑电图（EEG）中的后部不对称性，如对侧延迟活动（CDA），已被用于研究侧向化工作记忆表征的主动存储，但关于这种不对称效应与回溯线索益处之间关系的结果仍无定论。我们在一项带有侧向化项目和连续执行反应的回溯线索工作记忆任务中记录了脑电图。在选择性或中性回溯线索之后，参与者将中央记忆探针的方向调整到被提示的项目上。选择性回溯线索引发了早期后部对侧负波（PCN）、前部引导注意力负波（ADAN）以及CDA的后期调制，表明主动存储集中在被提示的信息上。通过将所有试验分为三个条件内表现分位数，我们可以进一步表明，高工作记忆准确性与回溯线索后CDA效应的持续增加相关。这些结果表明，将资源集中在相关表征的主动存储上是工作记忆任务中回溯线索益处的一个重要因素。
