Increasing evidence has shown that positive affect enhances many aspects of daily functioning. Yet, how dispositional positive affect is represented in the intrinsic brain networks remains unclear. Here, we used resting-state functional Magnetic Resonance Imaging to test how trait positive and negative affect of an individual were associated with the intrinsic connectivity of brain regions within the salience and emotion network and the default mode network in 70 healthy young adults. We observed that positive affect was negatively associated with connectivity within the salience and emotion network, particularly with the bidirectional connections spanning the left anterior insula and left nucleus accumbens. For connections between the salience and emotion network and the rest of the brain, we observed that positive affect was negatively related to the connectivity between the right amygdala and the right middle temporal gyrus. Affect-based modulations of connectivity were specific to positive affect and to the salience and emotion network. Our findings highlight the critical role of salience and emotion network in the neural relations of positive affect, and lay the groundwork for future studies on modeling the connectivity of salience and emotion network to predict mental well-being.

越来越多的证据表明，积极的影响可以增强日常功能的许多方面。然而，内在大脑网络中如何表现性格积极影响仍不清楚。在这里，我们使用静息状态功能磁共振成像来测试个体的积极和消极影响特征如何与 70 名健康年轻人的显着性和情绪网络以及默认模式网络内的大脑区域的内在连通性相关联。我们观察到积极影响与显着性和情绪网络内的连接呈负相关，特别是与跨越左前岛叶和左伏隔核的双向连接有关。对于显着性和情感网络与大脑其他部分之间的连接，我们观察到积极影响与右侧杏仁核和右侧颞中回之间的连接呈负相关。基于情感的连通性调制特定于积极情感以及显着性和情感网络。我们的研究结果强调了显着性和情绪网络在积极情感的神经关系中的关键作用，并为未来研究显着性和情绪网络的连通性以预测心理健康奠定了基础。