Institute of Psychology, Eberhard Karls University, Tuebingen, Germany; Center for Neurocognitive Research, University of Salzburg, Austria.
Brain Res. 2010 Mar 12;1320:85-94. doi: 10.1016/j.brainres.2010.01.005. Epub 2010 Jan 14.
Neuroimaging evidence points towards the left inferior parietal cortex to be crucial for the representation and retrieval of multiplication facts. However, to date studies allowing a functional interpretation of neuroimaging data are still scarce. In the current study we aimed at evaluating the functional involvement of left inferior parietal cortex areas in the implicit retrieval of multiplication fact knowledge in a number bisection task by examining event-related desynchronization (ERD) in the upper alpha band. Upper alpha ERD is generally agreed to be modulated by processes of memory retrieval. It was observed that upper alpha ERD decreased for multiplicative triplets (e.g. 3_6_9) but not for non-multiplicative (e.g. 2_5_8) triplets at left parietal electrodes but increased at left prefrontal electrodes. These results are interpreted to suggest that after multiplicativity has been recognized further magnitude evaluations in the left hemisphere may be abated by prefrontal processes of executive control.
神经影像学证据表明，左顶下小叶对于乘法事实的表示和提取至关重要。然而，迄今为止，允许对神经影像学数据进行功能解释的研究仍然很少。在当前的研究中，我们旨在通过检查上 alpha 频段的事件相关去同步（ERD），评估左顶下小叶区域在数量二分任务中对乘法事实知识的内隐检索的功能参与，以评估左顶下小叶区域的功能参与。上 alpha ERD 通常被认为是由记忆检索过程调制的。结果表明，左顶叶电极上的乘法三元组（例如 3_6_9）的上 alpha ERD 减少，但非乘法三元组（例如 2_5_8）的上 alpha ERD 不减少，而左前额叶电极上的上 alpha ERD 增加。这些结果表明，在识别乘法性之后，左半球的进一步大小评估可能会被前额叶的执行控制过程所削弱。
