Katholieke Universiteit Leuven (K.U.L.), Belgium.
J Cogn Neurosci. 2011 Mar;23(3):622-30. doi: 10.1162/jocn.2010.21445. Epub 2010 Mar 4.
Numbers are known to be processed along the left and right intraparietal sulcus. The present study investigated hemispheric differences between the magnitude representation of small and large symbolic numbers. To this purpose, an fMRI adaptation paradigm was used, where the continuous presentation of a habituation number was interrupted by an occasional deviant number. The results presented a distance-dependent increase of activation: larger ratios of habituation and deviant number caused a larger recovery of activation. Similar activation patterns were observed for small and large symbolic numbers, which is in line with the idea of a more coarse magnitude representation for large numbers. Interestingly, this pattern of activation was only observed in the left parietal cortex, supporting the recently proposed idea of Ansari [Ansari, D. Does the parietal cortex distinguish between "10", "Ten," and Ten Dots? Neuron, 53, 165-167, 2007] that the left parietal cortex is specialized in the processing of encultured symbolically presented numbers.
数字被认为是沿着左右顶内沟进行加工的。本研究调查了小和大符号数字的大小表示之间的半球差异。为此，使用了 fMRI 适应范式，其中习惯数字的连续呈现被偶尔的异常数字打断。结果呈现出依赖距离的激活增加：习惯和异常数字的比值越大，激活的恢复越大。对于小和大符号数字，观察到了相似的激活模式，这与大数的更粗糙的大小表示的观点一致。有趣的是，这种激活模式仅在左顶叶皮层中观察到，这支持了 Ansari [Ansari, D. Does the parietal cortex distinguish between "10", "Ten," and Ten Dots? Neuron, 53, 165-167, 2007] 的最近提出的观点，即左顶叶皮层专门处理文化符号呈现的数字。
