Common and Specific Contributions of the Intraparietal Sulci to Numerosity and Length Processing
Common and Specific Contributions of the Intraparietal Sulci to Numerosity and Length Processing
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DOI：
10.1002/hbm.20677
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发表时间：
2009-08-01
影响因子：
4.8
通讯作者：
Pesenti, Mauro
中科院分区：
文献类型：
--
作者：
Dormal, Valerie;Pesenti, Mauro
数值星等和空间星等的处理长期以来一直密切相关，这导致了它们共享一个共同的星等表示系统的建议。尽管对涉及数量和空间估计的大脑区域的单独研究指向顶叶皮质，但精确的解剖重叠（如果有的话）尚未直接建立。在这里，功能磁共振成像被用来定位参与处理数量和长度的大脑网络。当健康志愿者在点的线性阵列上进行数量比较，以及在点的离散线性阵列和连续矩形上进行长度比较时，测量血氧水平依赖的信号变化。结果表明，双侧参与的顶内沟周围的顶区在显式和隐式的数字处理，和右侧偏侧枕顶网络激活的长度处理;数字和长度处理都激活右侧IPS和中央前回。通过排除强制性的内在空间处理的阵列，我们表明，左IPS只参与数字处理，而右IPS的基础是一个共同的处理机制或表示的空间和数值大小。《脑图谱》30：2466-2476，2009年。(c)2009 Wiley-Liss，Inc.
Numerical and spatial magnitude processing have long been intimately associated, leading to the suggestion that they share a common system of magnitude representation. Although separate investigations on the cerebral areas involved in numerosity and spatial estimation point toward the parietal cortex, the precise anatomical overlap, if any, has not yet been directly established. Here, functional magnetic resonance imaging was used to localize the cerebral network involved in processing both numerosity and length. Blood oxygenation level-dependent signal changes were measured while healthy volunteers were making numerosity comparisons on linear arrays of dots, and length comparisons on discrete linear arrays of dots and continuous rectangles. The results show the bilateral involvement of parietal regions around the intraparietal sulci in explicit and implicit processing of numerosity, and a right lateralized occipitoparietal network activation in length processing; numerosity and length processing both activate the right IPS and the precentral gyrus. By excluding the mandatory intrinsic spatial processing of arrays, we demonstrate that the left IPS is involved in numerosity processing only, whereas the right IPS underlies a common processing mechanism or representation of spatial and numerical magnitude. Hum Brain Mapp 30:2466-2476, 2009. (c) 2009 Wiley-Liss, Inc.