Sarah M Tashjian, Joseph Cussen, Wenning Deng, Bo Zhang, Dean Mobbs
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引用次数: 0
摘要
自我保护的关键是识别我们何时安全,何时处于危险之中的能力。以前的研究主要集中在基于外部威胁特征的安全估计上,而没有考虑大脑如何整合其他关键因素,包括对我们保护自己的能力的估计。在这里,我们研究了安全在线动态编码背后的神经系统。目前的预注册研究使用了2个新任务来测试安全估计的4个方面:安全预测、元表示、识别和价值更新。我们通过实验操纵了安全估计,改变了外部威胁和自我保护的水平。数据收集于2个独立样本(行为N = 100;Mri n = 30)。我们发现了一致的证据,表明保护措施对安全的敏感性发生了主观变化。腹内侧前额叶皮层(vmPFC)的神经反应在所有安全估计方面都跟踪了安全性的增加,并对保护进行了特定的调整。此外,信息连通性分析显示,vmPFC后部和前部的安全编码中枢分别用于外部威胁和保护。这些发现揭示了vmPFC在编码安全方面的核心作用。
Subregions in the ventromedial prefrontal cortex integrate threat and protective information to meta-represent safety.
Pivotal to self-preservation is the ability to identify when we are safe and when we are in danger. Previous studies have focused on safety estimations based on the features of external threats and do not consider how the brain integrates other key factors, including estimates about our ability to protect ourselves. Here, we examine the neural systems underlying the online dynamic encoding of safety. The current preregistered study used 2 novel tasks to test 4 facets of safety estimation: Safety Prediction, Meta-representation, Recognition, and Value Updating. We experimentally manipulated safety estimation changing both levels of external threats and self-protection. Data were collected in 2 independent samples (behavioral N = 100; MRI N = 30). We found consistent evidence of subjective changes in the sensitivity to safety conferred through protection. Neural responses in the ventromedial prefrontal cortex (vmPFC) tracked increases in safety during all safety estimation facets, with specific tuning to protection. Further, informational connectivity analyses revealed distinct hubs of safety coding in the posterior and anterior vmPFC for external threats and protection, respectively. These findings reveal a central role of the vmPFC for coding safety.
期刊介绍:
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