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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The human brain is intrinsically organized into dynamic, anticorrelated functional networks
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The human brain is intrinsically organized into dynamic, anticorrelated functional networks

机译：人脑本质上组织成动态的，反相关的功能网络

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摘要

During performance of attention-demanding cognitive tasks, certain regions of the brain routinely increase activity, whereas others routinely decrease activity. In this study, we investigate the extent to which this task-related dichotomy is represented intrinsically in the resting human brain through examination of spontaneous fluctuations in the functional MRI blood oxygen level-dependent signal. We identify two diametrically opposed, widely distributed brain networks on the basis of both spontaneous correlations within each network and anticorrelations between networks. One network consists of regions routinely exhibiting task-related activations and the other of regions routinely exhibiting task-related deactivations. This intrinsic organization, featuring the presence of anticorrelated networks in the absence of overt task performance, provides a critical context in which to understand brain function. We suggest that both task-driven neuronal responses and behavior are reflections of this dynamic, ongoing, functional organization of the brain.
机译：在执行需要注意的认知任务时，大脑的某些区域通常会增加活动，而其他区域通常会减少活动。在这项研究中，我们通过检查功能性MRI血氧水平依赖性信号的自发性波动，研究了与任务相关的二分法在休息的人脑中固有地表现的程度。我们根据每个网络中的自发相关性和网络之间的反相关性来确定两个截然相反的，分布广泛的大脑网络。一个网络由通常表现出与任务相关的激活的区域组成，而另一个网络则具有通常表现出与任务相关的激活的区域。这种内在的组织在没有明显的任务执行的情况下以反相关网络的存在为特征，为理解大脑功能提供了关键的环境。我们建议任务驱动的神经元反应和行为都反映了这种动态，持续，功能性的大脑组织。

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