Distributed and overlapping cerebral representations of number, size, and luminance during comparative judgments
Distributed and overlapping cerebral representations of number, size, and luminance during comparative judgments
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DOI：
10.1016/s0896-6273(04)00107-2
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发表时间：
2004-03-25
期刊：
影响因子：
16.2
通讯作者：
Dehaene, S
中科院分区：
文献类型：
--
作者：
Pinel, P;Piazza, M;Dehaene, S
比较判断在人脑中是如何进行的？我们用功能磁共振成像扫描受试者，同时他们比较刺激的大小，亮度或数量。区域参与比较判断确定使用三个标准：任务相关的激活，存在的距离效应，和干扰的一个维度上的其他。我们观察到相当大的重叠，在三个比较任务的神经基板。有趣的是，重叠的数量预测了跨维度干扰的数量：在行为和功能磁共振成像中，数量干扰了大小，大小干扰了亮度，但数量不干扰亮度。结果表明，在比较判断，相关的连续量表示在分布和重叠的神经种群，数量和大小从事一个共同的顶叶空间代码，而大小和亮度从事共享枕-颞知觉表征。
How are comparative judgments performed in the human brain? We scanned subjects with fMRI while they compared stimuli for size, luminance, or number. Regions involved in comparative judgments were identified using three criteria: task-related activation, presence of a distance effect, and interference of one dimension onto the other. We observed considerable overlap in the neural substrates of the three comparison tasks. Interestingly, the amount of overlap predicted the amount of cross-dimensional interference: in both behavior and fMRI, number interfered with size and size with luminance, but number did not interfere with luminance. The results suggest that during comparative judgments, the relevant continuous quantities are represented in distributed and overlapping neural populations, with number and size engaging a common parietal spatial code, while size and luminance engage shared occipito-temporal perceptual representations.