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The neural mechanisms of percept-memory comparison in visual working memory

机译:视觉工作记忆中知觉-记忆比较的神经机制

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Researchers have revealed that comparing the perceptual input with the representations stored in visual working memory initiates a rapid attention-shift, which is predominantly triggered by the relevant-feature change. The comprehension of the change contents further necessitates a follow-up comparison that contrasts all the object features regardless of the task relevancy. However, whether such a distinct stage exists and how the process is carried on need further verification. We explored this issue by investigating the underlying neural mechanisms of the percept-memory comparison. By recording EEG, we found that both the task-relevant and -irrelevant feature changes elicited significantly more negative anterior N2 waves (230-340. ms) rooting in the anterior cingulate cortex (ACC), and meanwhile activated the frontal theta (5-8. Hz, 250-550. ms). These results suggest that a distinct comparison stage does exist, which is supported by the anterior N2, ACC and frontal theta.
机译:研究人员发现,将感知输入与视觉工作记忆中存储的表示进行比较会引发快速的注意力转移,这主要是由相关功能的变化触发的。对变更内容的理解还需要进行后续比较,以对比所有对象特征,而与任务的相关性无关。但是,是否存在这样一个不同的阶段以及该过程如何进行需要进一步验证。我们通过研究知觉-记忆比较的潜在神经机制探索了这个问题。通过记录脑电图,我们发现与任务相关和-不相关的特征变化均引起更多的负前N2波(230-340。ms)根植在前扣带回皮质(ACC)中,并同时激活额叶theta(5- 8. Hz,250-550。ms)。这些结果表明确实存在一个独特的比较阶段,这由前N2,ACC和额叶theta支持。

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