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首页> 外文期刊>Neuron >Neural Correlates of Visual Working Memory. fMRI Amplitude Predicts Task Performance.
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Neural Correlates of Visual Working Memory. fMRI Amplitude Predicts Task Performance.

机译：视觉工作记忆的神经相关。 fMRI振幅可预测任务性能。

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摘要

We used fMRI to investigate how moment-to-moment neural activity contributes to success or failure on individual trials of a visual working memory (WM) task. We found that different nodes of a distributed cortical network were activated to a greater extent for correct compared to incorrect trials during stimulus encoding, memory maintenance during delays, and at test. A logistic regression analysis revealed that the fMRI signal amplitude during the delay interval in a network of frontoparietal regions predicted successful performance on a trial-by-trial basis. Differential delay activity occurred even for only those trials in which BOLD activity during encoding was strong, demonstrating that it was not a simple consequence of effective versus ineffective encoding. Our results indicate that accurate memory depends on strong sustained signals that span the delay interval of WM tasks.
机译：我们使用功能磁共振成像来研究瞬间工作瞬间的神经活动如何对视觉工作记忆（WM）任务的个别试验产生成功或失败。我们发现，与刺激编码过程中的不正确试验，延迟过程中以及测试时的内存维护相比，分布式皮质网络的不同节点在更大程度上被激活以进行正确的测试。 Logistic回归分析显示，在额前额叶区域网络的延迟间隔内，fMRI信号幅度预测了逐项试验的成功表现。即使仅在编码过程中BOLD活性较强的那些试验中，也会出现差异性延迟活性，这表明这不是有效编码与无效编码的简单结果。我们的结果表明，准确的内存依赖于跨越WM任务延迟间隔的强持续信号。

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