TMS Over the Right Precuneus Reduces the Bilateral Field Advantage in Visual Short Term Memory Capacity
TMS Over the Right Precuneus Reduces the Bilateral Field Advantage in Visual Short Term Memory Capacity
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DOI：
10.1016/j.brs.2014.11.004
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发表时间：
2015-03-01
影响因子：
7.7
通讯作者：
Brandt, Stephan A.
中科院分区：
文献类型：
--
作者：
Kraft, Antje;Dyrholm, Mads;Brandt, Stephan A.
背景资料：一些研究表明，在早期视觉注意加工中存在双侧视野优势（BFA），即当刺激分散在两个视觉半野时，视觉加工增强。结果让人想起平行视觉注意处理的半球资源模型，表明双侧显示的早期视觉处理水平上有更多的注意资源[例如Sereno AB，Kosslyn SM。半野内和半野之间的歧视：注意力理论的新约束。Neuropsychologia 1991; 29（7）：659-75.].一些研究表明，BFA延伸到视觉注意加工的早期阶段之外，表明当刺激分布在双侧而不是单侧时，视觉短期记忆（VSTM）容量更高。视觉注意力理论。Psychol Rev 1990; 97（4）：523-47.]我们使用了一个整体的报告范式，允许调查视觉注意能力的变异性，在单侧和双侧显示器在导航重复经颅磁刺激（rTMS）的楔前叶region.Results：一个强大的BFA在VSTM存储容量是明显的rTMS后，在左楔前叶和控制条件下没有rTMS。相反，右侧楔前叶的BFA随着rTMS而减少。结论：这一发现表明右侧楔前叶在VSTM能力中发挥着因果作用，特别是在双侧视觉显示中。(C)2015爱思唯尔公司All rights reserved.
Background: Several studies have demonstrated a bilateral field advantage (BFA) in early visual attentional processing, that is, enhanced visual processing when stimuli are spread across both visual hemifields. The results are reminiscent of a hemispheric resource model of parallel visual attentional processing, suggesting more attentional resources on an early level of visual processing for bilateral displays [e.g. Sereno AB, Kosslyn SM. Discrimination within and between hemifields: a new constraint on theories of attention. Neuropsychologia 1991; 29(7): 659-75.]. Several studies have shown that the BFA extends beyond early stages of visual attentional processing, demonstrating that visual short term memory (VSTM) capacity is higher when stimuli are distributed bilaterally rather than unilaterally.Objective/hypothesis: Here we examine whether hemisphere-specific resources are also evident on later stages of visual attentional processing.Methods: Based on the Theory of Visual Attention (TVA) [Bundesen C. A theory of visual attention. Psychol Rev 1990; 97(4): 523-47.] we used a whole report paradigm that allows investigating visual attention capacity variability in unilateral and bilateral displays during navigated repetitive transcranial magnetic stimulation (rTMS) of the precuneus region.Results: A robust BFA in VSTM storage capacity was apparent after rTMS over the left precuneus and in the control condition without rTMS. In contrast, the BFA diminished with rTMS over the right precuneus. Conclusion: This finding indicates that the right precuneus plays a causal role in VSTM capacity, particularly in bilateral visual displays. (C) 2015 Elsevier Inc. All rights reserved.