Directing spatial attention in mental representations: Interactions between attentional orienting and working-memory load
Directing spatial attention in mental representations: Interactions between attentional orienting and working-memory load
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DOI：
10.1016/j.neuroimage.2005.02.026
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发表时间：
2005-07-01
期刊：
影响因子：
5.7
通讯作者：
Nobrea, AC
中科院分区：
文献类型：
--
作者：
Lepsien, J;Griffin, IC;Nobrea, AC
在过去的几十年里，人们对将空间注意力集中在超个人世界的位置进行了深入的研究。最近，研究表明，将注意力转移到工作记忆中心理表征的位置也是可能的。这是一个重要的问题，因为我们的注意力分配不仅受到外部刺激的指导，还受到它们的内部表征和我们建立在它们之上的期望的指导。本实验使用行为测量和事件相关的功能磁共振成像来研究心理表征的空间定向是否可以调节工作记忆中信息的搜索和检索，并分别识别所涉及的神经系统。参与者观看了一系列彩色十字架。在它消失几秒钟后，他们被提示到阵列中具有有效或中性提示的位置。随后，他们决定阵列中是否存在探针刺激。行为结果表明，工作记忆中空间注意力的定向减弱了记忆负荷增加时表现下降的众所周知的影响。因此，“内部”的空间定向似乎可以突出显示信息或促进工作记忆中的搜索，从而在检索中带来优势。成像技术能够将支持空间定向功能的大脑区域与对工作记忆负荷敏感的大脑区域分开。将空间注意力定向到工作记忆的内容会激活双侧后顶叶皮质、岛叶以及外侧和内侧额叶皮质。 (c) 2005 Elsevier Inc. 保留所有权利。
Orienting spatial attention to locations in the extrapersonal world has been intensively investigated during the past decades. Recently, it was demonstrated that it is also possible to shift attention to locations within mental representations held in working memory. This is an important issue, since the allocation of our attention is not only guided by external stimuli, but also by their internal representations and the expectations we build upon them. The present experiment used behavioural measures and event-related functional magnetic resonance imaging to investigate whether spatial orienting to mental representations can modulate the search and retrieval of information from working memory, and to identify the neural systems involved, respectively. Participants viewed an array of coloured crosses. Seconds after its disappearance, they were cued to locations in the array with valid or neutral cues. Subsequently, they decided whether a probe stimulus was presented in the array. The behavioural results indicated that orienting of spatial attention within working memory attenuates the well-known effect of decreasing performance when memory load is increased. So "internal", spatial orienting seems to highlight information or facilitate search within working memory, which leads to advantages in retrieval. Imaging enabled the separation of brain areas supporting spatial orienting functions from those sensitive to working-memory load. Orienting of spatial attention to the contents of working memory activated posterior parietal cortex bilaterally, the insula, and lateral and medial frontal cortices. (c) 2005 Elsevier Inc. All rights reserved.