Effects of problem size and arithmetic operation on brain activation during calculation in children with varying levels of arithmetical fluency
Effects of problem size and arithmetic operation on brain activation during calculation in children with varying levels of arithmetical fluency
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DOI：
10.1016/j.neuroimage.2010.12.037
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发表时间：
2011-08-01
期刊：
影响因子：
5.7
通讯作者：
Ansari, Daniel
中科院分区：
文献类型：
--
作者：
De Smedt, Bert;Holloway, Ian D.;Ansari, Daniel
在教育神经科学领域，大多数关于数学学习的研究都集中在儿童非常初级的数字处理技能的神经相关性上。人们对学校正式教授的更复杂的数学技能（如算术）知之甚少。本研究采用功能磁共振成像技术，对28名10-12岁不同算术流畅性水平儿童进行了数字加减运算时的脑激活受问题大小和算术运算影响的研究。与成年人的数据相对应，大的问题和减法激活额顶叶网络，包括顶内沟，后者表明程序策略执行过程中基于数量的过程的影响。与成年人不同的是，本研究结果显示，特别是左侧海马是活跃的，在解决这些问题，预计将解决的手段，事实检索（即小问题和添加），这表明海马在学习算术事实的早期阶段的具体作用。低水平的算术流畅性的儿童表现出较高的激活在右侧顶内沟的问题的解决过程中，一个相对较小的问题的大小，表明他们继续在更大程度上依赖于基于数量的策略，这些问题的儿童相对较高的算术流畅性已经从记忆中检索。这可能代表了数学困难儿童事实提取障碍的神经相关性。(c)2010年爱思唯尔公司All rights reserved.
Most studies on mathematics learning in the field of educational neuroscience have focused on the neural correlates of very elementary numerical processing skills in children. Little is known about more complex mathematical skills that are formally taught in school, such as arithmetic. Using functional magnetic resonance imaging, the present study investigated how brain activation during single-digit addition and subtraction is modulated by problem size and arithmetic operation in 28 children aged 10-12 years with different levels of arithmetical fluency. Commensurate with adult data, large problems and subtractions activated a fronto-parietal network, including the intraparietal sulci, the latter of which indicates the influence of quantity-based processes during procedural strategy execution. Different from adults, the present findings revealed that particularly the left hippocampus was active during the solution of those problems that are expected to be solved by means of fact retrieval (i.e. small problems and addition), suggesting a specific role of the hippocampus in the early stages of learning arithmetic facts. Children with low levels of arithmetical fluency showed higher activation in the right intraparietal sulcus during the solution of problems with a relatively small problem size, indicating that they continued to rely to a greater extent on quantity-based strategies on those problems that the children with relatively higher arithmetical fluency already retrieved from memory. This might represent a neural correlate of fact retrieval impairments in children with mathematical difficulties. (c) 2010 Elsevier Inc. All rights reserved.