Simos Panagiotis G, Kanatsouli Kassiani, Fletcher Jack M, Sarkari Shirin, Juranek Jennifer, Cirino Paul, Passaro Antony, Papanicolaou Andrew C
Department of Pediatrics, Children's Learning Institute, University of Texas Health Science Center at Houston, TX, USA.
Neuropsychology. 2008 Sep;22(5):571-84. doi: 10.1037/0894-4105.22.5.571.
The study investigates the relative degree and timing of cortical activation in parietal, temporal, and frontal regions during simple arithmetic tasks in children who experience math difficulties. Real-time brain activity was measured with magnetoencephalography during simple addition and numerosity judgments in students with math difficulties and average or above average reading skills (MD group, N = 14), students with below average scores on both math and basic reading tests (MD/RD group, N = 16) and students with above average scores on standardized math tests (control group, N = 25). Children with MD showed increased degree of neurophysiological activity in inferior and superior parietal regions in the right hemisphere compared to both controls and MD/RD students. Left hemisphere inferior parietal regions did not show the expected task-related changes and showed activity at a significant temporal delay. MD students also showed increased early engagement of prefrontal cortices. Taken together, these findings may indicate increased reliance on a network of right hemisphere parietal (and possibly frontal areas as well) for simple math calculations in students who experience math difficulties but perform within normal range in reading.
该研究调查了有数学困难的儿童在进行简单算术任务时，顶叶、颞叶和额叶区域皮质激活的相对程度和时间。在有数学困难但阅读技能处于平均水平或高于平均水平的学生（数学困难组，N = 14）、数学和基础阅读测试成绩均低于平均水平的学生（数学/阅读困难组，N = 16）以及标准化数学测试成绩高于平均水平的学生（对照组，N = 25）进行简单加法和数字判断期间，通过脑磁图测量实时脑活动。与对照组和数学/阅读困难学生相比，数学困难儿童右半球顶叶上下区域的神经生理活动程度增加。左半球顶叶下部区域未显示出预期的与任务相关的变化，且在显著的时间延迟后才出现活动。数学困难学生还表现出前额叶皮质早期参与增加。综合来看，这些发现可能表明，有数学困难但阅读能力在正常范围内的学生在进行简单数学计算时，对右半球顶叶（可能还有额叶区域）网络的依赖增加。
