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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Experience sampling during fMRI reveals default network and executive system contributions to mind wandering
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Experience sampling during fMRI reveals default network and executive system contributions to mind wandering

机译：功能磁共振成像期间的经验采样揭示了默认网络和执行系统对思维游荡的贡献

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摘要

Although mind wandering occupies a large proportion of our waking life, its neural basis and relation to ongoing behavior remain controversial. We report an fMRI study that used experience sampling to provide an online measure of mind wandering during a concurrent task. Analyses focused on the interval of time immediately preceding experience sampling probes demonstrate activation of default network regions during mind wandering, a finding consistent with theoretical accounts of default network functions. Activation in medial prefrontal default network regions was observed both in association with subjective self-reports of mind wandering and an independent behavioral measure (performance errors on the concurrent task). In addition to default network activation, mind wandering was associated with executive network recruitment, a finding predicted by behavioral theories of off-task thought and its relation to executive resources. Finally, neural recruitment in both default and executive network regions was strongest when subjects were unaware of their own mind wandering, suggesting that mind wandering is most pronounced when it lacks meta-awareness. The observed parallel recruitment of executive and default network regions-two brain systems that so far have been assumed to work in opposition-suggests that mind wandering may evoke a unique mental state that may allow otherwise opposing networks to work in cooperation. The ability of this study to reveal a number of crucial aspects of the neural recruitment associated with mind wandering underscores the value of combining subjective self-reports with online measures of brain function for advancing our understanding of the neurophenomenology of subjective experience.
机译：尽管思维游走占据了我们清醒生活的很大一部分，但是它的神经基础和与持续行为的关系仍然存在争议。我们报道了一项功能磁共振成像研究，该研究使用经验采样来提供在线测量在并发任务期间思维游荡的方法。集中在紧接经验采样探查之前的时间间隔上的分析表明，在思想游荡期间默认网络区域的激活，这一发现与默认网络功能的理论说明相符。观察到内侧前额叶默认网络区域中的激活与主观的心理游荡自我报告和独立的行为量度（并发任务上的性能错误）相关。除了默认的网络激活外，思维游荡还与高管网络招聘有关，这是由任务外思维及其与高管资源的关系的行为理论预测的发现。最后，当受试者不知道自己的思维游荡时，默认和执行网络区域的神经募集最强，这表明思维游荡在缺乏元意识时最为明显。观察到的平行执行区域和默认网络区域的募集-到目前为止，已经假设两个大脑系统都可以在反对派中工作，这表明思维游荡可能会唤起一种独特的心理状态，而这种心理状态可能会使相反的反对派网络协同工作。这项研究揭示与游荡有关的神经募集的许多关键方面的能力强调了将主观自我报告与脑功能在线测量相结合的价值，以增进我们对主观体验的神经现象学的理解。

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