This study aims to examine neural correlates of spontaneous deception in a non-competitive interpersonal situation, and the difference in neural correlates between spontaneous deception and instructed deception using functional near-infrared spectroscopy (fNIRS). We used a modified poker game in which participants freely decided whether sending a piece of truthful/deceptive information to other participants. In the instructed session, participants sent truthful/deceptive information per the instructions. In this non-competitive interpersonal situation in the orbitofrontal cortex (OFC) and dorsolateral prefrontal cortex (DLPFC), deception produced higher neural activities than truth-telling. In addition, spontaneous deception exhibited higher neural activities than instructed deception in the frontopolar area, DLPFC, and frontal eye fields. Spontaneous truth-telling produced higher neural activities than instructed truth-telling in frontal eye fields and frontopolar area. This study provides evidence about neural correlates of spontaneous deception during non-competitive interpersonal scenarios and the difference between spontaneous deception and instructed deception.

这项研究旨在检查在非竞争性人际情况下自发欺骗的神经相关性，以及使用功能近红外光谱（fNIRS）在自发欺骗与指示性欺骗之间的神经相关性差异。我们使用了一种改进的扑克游戏，参与者可以自由决定是否向其他参与者发送真实/欺骗性信息。在指导的课程中，参与者按照说明发送了真实/欺骗性的信息。在眶额皮层（OFC）和背外侧前额叶皮层（DLPFC）的这种非竞争性人际关系中，欺骗产生的神经活动比真言多。另外，在额极区域，DLPFC和额眼视野中，自发性欺骗表现出比指示性欺骗更高的神经活动。在额眼视野和额极区域中，自发的真言表达产生的神经活动比所指示的真言表达更高。这项研究提供了有关非竞争性人际场景下自发欺骗的神经相关性以及自发欺骗与指示性欺骗之间差异的证据。