How number line estimation skills relate to neural activations in single digit subtraction problems.
How number line estimation skills relate to neural activations in single digit subtraction problems.
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DOI：
10.1016/j.neuroimage.2014.12.011
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发表时间：
2015-02-15
期刊：
影响因子：
5.7
通讯作者：
Booth JR
中科院分区：
文献类型：
--
作者：
Berteletti I;Man G;Booth JR
数字直线任务要求判断一个数字的相对数值大小，并在空间上估计其在连续直线上的值。孩子们在这项任务上的技能已经被证明与未来的数学能力相关并预测。在神经功能上，这项任务已经被证明依赖于参与数字处理的大脑区域。然而，没有直接证据表明NL任务的表现与在算术处理过程中招募的大脑区域有关，也没有直接证据表明这些区域是特定于数字处理的领域。在这项研究中，我们测试了8到14岁儿童在NL任务中的行为表现是否与在小的和大的个位数减法问题中的fMRI激活有关。数字加工的领域特定区域通过数量判断任务被独立定位。结果表明，NL估计性能与算法处理关键区域的激活量有直接关系。在数值大小(即顶内沟)和视觉空间区域(即后顶上小叶)上，较好的NL估计者比较差的NL估计者显示出更大的问题大小效应，其特点是对小问题的激活较少。此外，在小的减法问题中，激活的方向与问题大小的差异有关。这项研究首次表明，在自然语言任务中的表现，即估计一个数字在一个区间上的空间位置，与在个位数减法问题中观察到的大脑活动有关，这些区域被认为涉及数字大小和空间加工。
The Number Line (NL) task requires judging the relative numerical magnitude of a number and estimating its value spatially on a continuous line. Children's skill on this task has been shown to correlate with and predict future mathematical competence. Neurofunctionally, this task has been shown to rely on brain regions involved in numerical processing. However, there is no direct evidence that performance on the NL task is related to brain areas recruited during arithmetical processing and that these areas are domain-specific to numerical processing. In this study, we test whether 8- to 14-year-old's behavioral performance on the NL task is related to fMRI activation during small and large single-digit subtraction problems. Domain-specific areas for numerical processing were independently localized through a numerosity judgment task. Results show a direct relation between NL estimation performance and the amount of the activation in key areas for arithmetical processing. Better NL estimators showed a larger problem size effect than poorer NL estimators in numerical magnitude (i.e., intraparietal sulcus) and visuospatial areas (i.e., posterior superior parietal lobules), marked by less activation for small problems. In addition, the direction of the activation with problem size within the IPS was associated to differences in accuracies for small subtraction problems. This study is the first to show that performance in the NL task, i.e. estimating the spatial position of a number on an interval, correlates with brain activity observed during single-digit subtraction problem in regions thought to be involved numerical magnitude and spatial processes.
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