The where and how of attention-based rehearsal in spatial working memory
The where and how of attention-based rehearsal in spatial working memory
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DOI：
10.1016/j.cogbrainres.2004.02.008
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发表时间：
2004-07-01
期刊：
影响因子：
--
通讯作者：
D'Esposito, M
中科院分区：
文献类型：
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作者：
Postle, BR;Awh, E;D'Esposito, M
人类空间工作记忆中的排练部分是通过空间选择性注意到记忆位置的隐蔽转移来完成的（“基于注意的排练”）。我们解决了关于基于注意的排练的两个突出问题：基于注意的排练效应的地形，以及它的运作机制。使用事件相关的AM和随机呈现延迟时期的试验程序，这些延迟时期要么充满闪烁的棋盘，要么没有填充，我们将影响定位在纹状皮层18和19区，并证实它在纹状皮层中不存在。在未填充的试验中，这些脑外区域以及顶叶上小叶和顶叶内沟的延迟活动也被侧向化，这表明基于注意力的排练会在代表空间中要记住的位置的区域产生基线偏移。没有额叶区域（包括额叶视野）表现出与注意力为基础的排练相一致的侧化活动。(C) 2004 Elsevier B.V.版权所有
Rehearsal in human spatial working memory is accomplished, in part, via covert shifts of spatial selective attention to memorized locations ("attention-based rehearsal"). We addressed two outstanding questions about attention-based rehearsal: the topography of the attention-based rehearsal effect, and the mechanism by which it operates. Using event-related AM and a procedure that randomized the presentation of trials with delay epochs that were either filled with a flickering checkerboard or unfilled, we localized the effect to extrastriate areas 18 and 19, and confirmed its absence in striate cortex. Delay-epoch activity in these extrastriate regions, as well as in superior parietal lobule and intraparietal sulcus, was also lateralized on unfilled trials, suggesting that attention-based rehearsal produces a baseline shift in areas representing the to-be-remembered location in space. No frontal regions (including frontal eye fields) demonstrated lateralized activity consistent with a role in attention-based rehearsal. (C) 2004 Elsevier B.V. All rights reserved.