A direct neural measure of variable precision representations in visual working memory.
A direct neural measure of variable precision representations in visual working memory.
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DOI：
10.1152/jn.00230.2021
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发表时间：
2021-09
影响因子：
2.5
通讯作者：
C. Merkel;M. V. Bartsch;M. Schoenfeld;A. Vellage;N. Müller;J. Hopf
中科院分区：
文献类型：
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作者：
C. Merkel;M. V. Bartsch;M. Schoenfeld;A. Vellage;N. Müller;J. Hopf
视觉工作记忆（VWM）是一种主动表示，即使在没有视觉输入的情况下也能操作项目信息。研究 VWM 的一种常见方法是分析稍后召回时的性能。然而，这种方法对于回忆性能的变化是归因于项目编码和维护还是归因于记忆信息的测试留下了不确定性。在这里，我们记录执行延迟定向精度估计任务的人类受试者的对侧延迟活动（CDA）——一种已建立的物品存储和维护的电生理测量方法。这使得我们能够将召回精度的波动直接与项目编码和维护的过程联系起来。我们表明，对于两个顺序编码的方向项，CDA 幅度反映了两个项的方向回忆的精度，精度越高，幅度越大。此外，我们表明每个项目的 CDA 幅度彼此独立变化，这表明记忆表示的精度独立波动。
Visual working memory (VWM) is an active representation enabling the manipulation of item information even in the absence of visual input. A common way to investigate VWM is to analyze the performance at later recall. This approach, however, leaves uncertainties about whether the variation of recall performance is attributable to item encoding and maintenance or to the testing of memorized information. Here, we record the contralateral delay activity (CDA) - an established electrophysiological measure of item storage and maintenance - in human subjects performing a delayed orientation precision estimation task. This allows us to link the fluctuation of recall precision directly to the process of item encoding and maintenance. We show that for two sequentially encoded orientation items, the CDA amplitude reflects the precision of orientation recall of both items, with higher precision being associated with a larger amplitude. Furthermore, we show that the CDA amplitude for each item varies independently from each other, suggesting that the precision of memory representations fluctuates independently.