The neural encoding of guesses in the human brain
The neural encoding of guesses in the human brain
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DOI：
10.1016/j.neuroimage.2011.08.106
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发表时间：
2012-01-16
期刊：
影响因子：
5.7
通讯作者：
Haynes, John-Dylan
中科院分区：
文献类型：
--
作者：
Bode, Stefan;Bogler, Carsten;Haynes, John-Dylan
人类的感知在很大程度上取决于感官信息的质量。当物体难以看清时，我们常常认为自己只是在猜测。在这里，我们调查了这种猜测是否使用参与感知决策的大脑网络或独立网络。我们使用功能磁共振成像和模式分类的组合来测试可见性如何影响信号，这些信号决定了选择。我们发现，关于清晰可见物体的决定是由大脑感觉区域的信号预测的，而当受试者看到看不见的物体并认为自己纯粹是猜测时，顶叶皮层的不同区域变得具有预测性。这种顶叶网络与以前被证明编码自由决策的区域高度重叠。因此，当感官信息不足时，大脑可能会使用专用网络来确定选择。(C)2011 Elsevier Inc. All rights reserved.
Human perception depends heavily on the quality of sensory information. When objects are hard to see we often believe ourselves to be purely guessing. Here we investigated whether such guesses use brain networks involved in perceptual decision making or independent networks. We used a combination of fMRI and pattern classification to test how visibility affects the signals, which determine choices. We found that decisions regarding clearly visible objects are predicted by signals in sensory brain regions, whereas different regions in parietal cortex became predictive when subjects were shown invisible objects and believed themselves to be purely guessing. This parietal network was highly overlapping with regions, which have previously been shown to encode free decisions. Thus, the brain might use a dedicated network for determining choices when insufficient sensory information is available. (C) 2011 Elsevier Inc. All rights reserved.