Cerebral activations during number multiplication and comparison: A PET study
Cerebral activations during number multiplication and comparison: A PET study
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DOI：
10.1016/0028-3932(96)00027-9
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发表时间：
1996-11-01
期刊：
影响因子：
2.6
通讯作者：
Mazoyer, B
中科院分区：
文献类型：
--
作者：
Dehaene, S;Tzourio, N;Mazoyer, B
采用正电子发射断层扫描技术，对8名正常志愿者进行了数字比较和乘法相关的脑网络检查。使用磁共振成像在每个受试者确定的感兴趣解剖区域内测量脑血流量。实验采用了三个条件：闭着眼睛休息，对阿拉伯数字进行心理乘法，对相同的数字进行大小比较。乘法和比较都激活了左侧和右侧枕叶皮质、左侧中央前回和辅助运动区。除了这些常见的激活，乘法还激活了左右顶下回，左侧梭形回和舌回，以及右侧楔形回。与对照相比，倍增在左侧豆状核和Brodmann‘s区也产生了更好的活动，并在中央前回和额叶下回的激活中引起了半球的不对称。相反，与乘法相比，对比发现右侧颞叶上回、左侧和右侧中回、右侧额叶上回和右侧额叶下回的活动更强。这些结果强调了双侧顶下区在数字加工中的作用，并表明乘法和比较可能依赖于部分不同的网络。版权所有(C)1996爱思唯尔科学有限公司。
Positron emission tomography was used to examine the cerebral networks underlying number comparison and multiplication in eight normal volunteers. Cerebral blood flow was measured within anatomical regions of interest defined in each subject using magnetic resonance imaging. Three conditions were used: rest with eyes closed, mental multiplication of pairs of arabic digits and larger-smaller comparison of the same pairs. Both multiplication and comparison activated the left and right lateral occipital cortices, the left precentral gyrus, and the supplementary motor area. Beyond these common activations, multiplication activated also the left and right inferior parietal gyri, the left fusiform and lingual gyri, and the right cuneus. Relative to comparison, multiplication also yielded superior activity in the left lenticular nucleus and in Brodmann's area 8, and induced a hemispheric asymmetry in the activation of the precentral and inferior frontal gyri. Conversely, relative to multiplication, comparison yielded superior activity in the right superior temporal gyrus, the left and right middle temporal gyri, the right superior frontal gyrus, and the right inferior frontal gyrus. These results underline the role of bilateral inferior parietal regions in number processing and suggest that multiplication and comparison may rest on partially distinct networks. Copyright (C) 1996 Elsevier Science Ltd.