有无反馈对欺骗过程的神经机制的调控作用

欺骗行为会导致欺骗结果的产生,欺骗结果又会直接影响欺骗行为的发生及其内在机制.虽然有研究表明,欺骗结果会对相应的欺骗过程产生调控作用,但对这一调控作用的机制并不清楚.本研究采用功能核磁共振技术,对两组被试分别使用有、无反馈(欺骗结果)的GKT范式并记录两组被试在进行诚实反应和欺骗反应时的大脑激活模式.结果发现,有反馈组与无反馈组相比,有反馈组的诚实反应和欺骗反应都导致了左侧顶叶皮层、左背部前扣带皮层、左侧脑岛、双侧视皮层和右侧小脑的更大激活;对两组而言,欺骗反应和诚实反应都导致了右腹外侧前额区域、双侧缘上回、左侧脑岛、右后内侧额叶、右侧颞中回和右侧纹状体的更大激活;此外,与无反馈组相比,有反馈组的欺骗反应与诚实反应在双侧纹状体和左侧脑岛上的激活差异更加明显.这些结果表明,有无欺骗结果对欺骗过程的神经机制具有调控作用,当需要面临欺骗结果时,欺骗过程将更大程度地涉及到奖赏预期和风险厌恶过程的参与.

The Existence of Feedback Modulates the Neural Mechanism Underlying Deception

Deception will result in some consequences （deception consequence）, which will in turn affect the mechanism underlying deception process. Previous studies have demonstrated that the deception consequence modulates the corresponding deception process; however, the neural mechanism underlying this modulation effect remains unclear. The present study investigated how the neural signals elicited by deceptive response would be modulated by whether response would be judged by the lie-detector about its facticity. After a mock murder situation, BOLD responses in the brains of 31 healthy volunteers were recorded while they underwent two versions of guilt knowledge test （GKT） paradigm. In the GKT paradigm for the feedback group, a feedback indicating whether the response was judged honest or deceptive was given by the lie-detector after each response of the participant, while in the GKT paradigm for the no-feedback group, there was no feedback after their responses. The results showed that the feedback group showed stronger acitivities in the left dorsal anterior cingulate cortex, insula, parietal lobe, the bilateral occipital lobe, and the right cerebellum than the no-feedback group, irrespective of whether the participants did deceptive responses or honest responses. While deceptive responses elicited stronger activities in the right ventral lateral prefrontal cortex, posterior medial frontal cortex, middle temporal gyrus, the bilateral supramarginal gyrus, and the left insua, relative to honest responses, regardless of which group the participants belonged to. Most importantly, the left insula and the bilateral striatum were selectively more responsive for the deceptive response versus honest response in the feedback group than in the no-feedback group. These results initially demonstrate the important influence of deception consequence on the neural mechanism of producing deception, suggesting that deception would arouse stronger risk evaluation and reward predication processes when the deceiver had to face so