Priority Switches in Visual Working Memory are Supported by Frontal Delta and Posterior Alpha Interactions.
Priority Switches in Visual Working Memory are Supported by Frontal Delta and Posterior Alpha Interactions.
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DOI：
10.1093/cercor/bhy223
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发表时间：
2018-11-01
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影响因子：
--
通讯作者：
Olivers CNL
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文献类型：
--
作者：
de Vries IEJ;van Driel J;Karacaoglu M;Olivers CNL
视觉工作记忆（VWM）区分了与迫在眉睫的知觉目标相关的表征和与未来的知觉目标相关的表征。我们研究了大脑如何顺序地优先处理连续任务的视觉工作记忆表征。观察者在两个视觉搜索任务的序列中记住了两个目标，从而使一个目标当前相关，而另一个目标未来相关。我们发现，在第一次搜索前的保持间隔内，与前瞻性搜索目标相比，当前目标的侧侧顶枕脑电图α (8-14 Hz)抑制更强。至关重要的是，在第一个和第二个搜索任务之间，后侧化的差异逆转，反映了两种目标表征优先状态的变化。连通性分析表明，后α侧化的这种开关是由额叶δ /低θ (2-6 Hz)活动驱动的。此外，这种额叶低频信号还能预测切换后的任务表现。因此，我们获得了在VWM中多个记忆表征优先状态之间灵活转换的大规模网络相互作用的证据。
Visual working memory (VWM) distinguishes between representations relevant for imminent versus future perceptual goals. We investigated how the brain sequentially prioritizes visual working memory representations that serve consecutive tasks. Observers remembered two targets for a sequence of two visual search tasks, thus making one target currently relevant, and the other prospectively relevant. We show that during the retention interval prior to the first search, lateralized parieto-occipital EEG alpha (8–14 Hz) suppression is stronger for current compared with prospective search targets. Crucially, between the first and second search task, this difference in posterior alpha lateralization reverses, reflecting the change in priority states of the two target representations. Connectivity analyses indicate that this switch in posterior alpha lateralization is driven by frontal delta/low-theta (2–6 Hz) activity. Moreover, this frontal low-frequency signal also predicts task performance after the switch. We thus obtained evidence for large-scale network interactions underlying the flexible shifting between the priority states of multiple memory representations in VWM.
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