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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Cascades and Cognitive State: Focused Attention Incurs Subcritical Dynamics
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Cascades and Cognitive State: Focused Attention Incurs Subcritical Dynamics

机译：级联和认知状态：集中注意力引起亚临界动力学

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摘要

The analysis of neuronal avalanches supports the hypothesis that the human cortex operates with critical neural dynamics. Here, we investigate the relationship between cascades of activity in electroencephalogram data, cognitive state, and reaction time in humans using a multimodal approach. We recruited 18 healthy volunteers for the acquisition of simultaneous electroencephalogram and functional magnetic resonance imaging during both rest and during a visuomotor cognitive task. We compared distributions of electroencephalogram-derived cascades to reference power laws for task and rest conditions. We then explored the large-scale spatial correspondence of these cascades in the simultaneously acquired functional magnetic resonance imaging data. Furthermore, we investigated whether individual variability in reaction times is associated with the amount of deviation from power law form. We found that while resting state cascades are associated with approximate power law form, the task state is associated with subcritical dynamics. Furthermore, we found that electroencephalogram cascades are related to blood oxygen level-dependent activation, predominantly in sensorimotor brain regions. Finally, we found that decreased reaction times during the task condition are associated with increased proximity to power law form of cascade distributions. These findings suggest that the resting state is associated with near-critical dynamics, in which a high dynamic range and a large repertoire of brain states may be advantageous. In contrast, a focused cognitive task induces subcritical dynamics, which is associated with a lower dynamic range, which in turn may reduce elements of interference affecting task performance.
机译：对神经元雪崩的分析支持这样的假说，即人类皮层在关键的神经动力学中起作用。在这里，我们使用多模式方法研究脑电图数据中的活动级联，认知状态和人类反应时间之间的关系。我们招募了18名健康志愿者，用于在休息和视觉运动认知任务中同时采集脑电图和功能磁共振成像。我们将脑电图级联的分布与任务和休息条件的参考功率定律进行了比较。然后，我们在同时获取的功能磁共振成像数据中探索了这些级联的大规模空间对应关系。此外，我们调查了反应时间的个体差异是否与偏离幂律形式的量有关。我们发现，虽然静止状态级联与近似幂律形式相关，但任务状态与亚临界动力学相关。此外，我们发现脑电图级联与血氧水平依赖性激活有关，主要在感觉运动性脑区域。最后，我们发现任务条件下反应时间的减少与级联分布的幂律形式的接近度增加有关。这些发现表明，静息状态与近临界动力学相关，其中高动态范围和大范围的大脑状态可能是有利的。相反，集中的认知任务会诱发亚临界动态，这与较低的动态范围相关联，这反过来又可以减少影响任务性能的干扰因素。

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