Effects of load and emotional state on EEG alpha-band power and inter-site synchrony during a visual working memory task.
Effects of load and emotional state on EEG alpha-band power and inter-site synchrony during a visual working memory task.
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DOI：
10.3758/s13415-020-00823-3
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发表时间：
2020-10
期刊：
影响因子：
--
通讯作者：
Keil A
中科院分区：
文献类型：
--
作者：
Figueira JSB;David IPA;Lobo I;Pacheco LB;Pereira MG;de Oliveira L;Keil A
动机/情感刺激是感官和认知系统有限能力的有力竞争者。因此，它们经常作为干扰物，干扰并行主要任务的性能。工作记忆的功能之一是保持与任务相关的信息集中，同时抑制分散注意力的刺激。在阿尔法波段（8-13 Hz）的宏观脑振荡最近已被确定为WM处理的神经相关。使用脑电图，我们研究了在何种程度上的变化，在一个典型的WM任务的阿尔法功率和站点间的连接是敏感的负荷和情绪分心。参与者进行了两个级别的负载（4与2个项目），这是由自然的场景被评为不愉快或中性，作为干扰因素的偏侧变化检测任务。结果表明，在保持间隔期间，与同侧半球相比，WM任务阵列对侧半球的顶枕区α降低。观察到额叶和枕叶传感器之间的选择性增强振荡耦合（1）在保持间隔期间作为负荷的函数，以及（2）在记忆阵列开始时，在观看中性后，与令人不快的干扰物相比。在保持间隔结束时，我们观察到更大的耦合期间不愉快，相比，中性条件。这些发现与以下概念一致：（1）在WM中代表更多项目需要跨皮质区域更大的互连性;（2）不愉快的情绪干扰因素通过扰乱编码阶段的处理来干扰后续的WM处理。
Motivationally/emotionally engaging stimuli are strong competitors for the limited capacity of sensory and cognitive systems. Thus, they often act as distractors, interfering with performance in concurrent primary tasks. Keeping task-relevant information in focus while suppressing the impact of distracting stimuli is one of the functions of working memory (WM). Macroscopic brain oscillations in the alpha band (8–13 Hz) have recently been identified as a neural correlate of WM processing. Using electroencephalography, we examined the extent to which changes in alpha power and inter-site connectivity during a typical WM task are sensitive to load and emotional distraction. Participants performed a lateralized change detection task with two levels of load (4 vs 2 items), which was preceded by naturalistic scenes rated either as unpleasant or neutral, acting as distractors. The results showed the expected parieto-occipital alpha reduction in the hemisphere contralateral to the WM task array, compared to the ipsilateral hemisphere, during the retention interval. Selectively heightened oscillatory coupling between frontal and occipital sensors was observed (1) during the retention interval as a function of load, and (2) upon the onset of the memory array, after viewing neutral, compared to unpleasant distractors. At the end of the retention interval, we observed greater coupling during the unpleasant, compared to the neutral condition. These findings are consistent with the notions (1) that representing more items in WM requires greater interconnectivity across cortical areas and (2) that unpleasant emotional distractors interfere with subsequent WM processing by disrupting processing during the encoding stage.
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影响因子：
16.2
作者：
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通讯作者：
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影响因子：
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