Does rehearsal matter? Left anterior temporal alpha and theta band changes correlate with the beneficial effects of rehearsal on working memory.
Does rehearsal matter? Left anterior temporal alpha and theta band changes correlate with the beneficial effects of rehearsal on working memory.
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DOI：
10.1016/j.neuropsychologia.2021.107825
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发表时间：
2021-05-14
期刊：
影响因子：
2.6
通讯作者：
Ellmore TM
中科院分区：
文献类型：
--
作者：
Plaska CR;Ng K;Ellmore TM
在工作记忆（WM）维护过程中的排练被认为是促进提取。很少有人知道排练如何调节WM延迟活动。在本研究中，44名受试者完成了一个斯滕贝格任务与完整的小说场景或相位混乱的场景，有相似的颜色和空间频率，但缺乏语义内容。在复述条件下，参与者在编码过程中产生一个描述性的标签，并在延迟期内秘密地复述。在抑制条件下，参与者在编码过程中没有产生标签，并在延迟期间被抑制（重复“the”）。这在前一种情况下（小说场景）很容易，但在后一种情况下（相位混乱的场景）更困难，因为场景缺乏语义内容。行为表现和EEG延迟活动作为维护策略的函数进行了分析。在WM期间的表现显示了排练的好处相扰，但不是完整的场景。检查的绝对振幅显示三个潜在的活动来源排练，包括左前颞叶（ATL）和左侧和中线顶叶区域。只有当标记不是自动的（例如，相位加扰的场景），这可以反映标记和排练中的差异（即，语义关联与浅标签）。我们的结论是，排练只有利于记忆的视觉刺激，缺乏语义信息，这是与α和θ节奏的变化。
Rehearsal during working memory (WM) maintenance is assumed to facilitate retrieval. Less is known about how rehearsal modulates WM delay activity. In the present study, 44 participants completed a Sternberg Task with either intact novel scenes or phase-scrambled scenes, which had similar color and spatial frequency but lacked semantic content. During the rehearsal condition participants generated a descriptive label during encoding and covertly rehearsed during the delay period. During the suppression condition participants did not generate a label during encoding and suppressed (repeated “the”) during the delay period. This was easy in the former (novel scenes) but more difficult in the later condition (phase-scrambled scenes) where scenes lacked semantic content. Behavioral performance and EEG delay activity was analyzed as a function of maintenance strategy. Performance during WM revealed a benefit of rehearsal for phase-scrambled but not intact scenes. Examination of the absolute amplitude revealed three underlying sources of activity for rehearsal, including the left anterior temporal (ATL) and left and midline parietal regions. Increases in alpha and theta activity in ATL were correlated with improvement in performance on WM with rehearsal only when labeling was not automatic (e.g., phase-scrambled scenes), which may reflect differences in labeling and rehearsal (i.e., semantic associations vs. shallow labels). We conclude that rehearsal only benefits memory for visual stimuli that lack semantic information, and that this is correlated with changes in alpha and theta rhythms.
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