Effects On Trust Game Decision-Making Based On The Face And Benefit-The Study On Fnirs Trust Brain Mechanism

The way one judges faces plays an important role in social life. In contemporary diversified society, faith plays an important role on human communication, and face acts as a key role. Therefore, research about the relationship between face trustworthiness and trust behavior can make us understand the basis and principle of its trust behavior profoundly. The differences of behavioral decision by trustor have been shown in the previous trust game study. In anther word, amount for the trusted is more than the untrusted by trustor.This study includes two experiments, experiment 1 is done through trust game and face trustworthiness of more faces in one time, which is designed to confirm the previous research results; Experiment 2 is done through trust game with an independent variable-benefits of more faces in one time. Using functional near infrared imaging (fNIRS) to explore the activation differences in the prefrontal cortex when he gives money, at the same time, add in the Go/No-go behavior test and Interpersonal trust questionnaire, for the sake of the association between them and trust game behavior and the degree of brain activation.The results showed:(1) Just like the previous research, there’re significant differences between the judgments of trusting it or not and the choice of giving money or not on the trusted faces and the untrusted faces by the subject as a trustor; (2)the brain region with significant differences of the face-trust trustworthiness and benefits on giving money is in the dorsolateral prefrontal cortex (DLPFC) of the participants in trust game, its specific region is in Brodmann 9 and Brodmann 46, which confirms cognitive control strategy in this area; (3) through the Go/No-Go implicit association test and interpersonal trust questionnaire were related with the degree of activation in brain regions respectively, we can get the result that it is also significantly related in the dorsolateral prefrontal cortex (DLPFC) (the higher the test result of behavior is, the more the trust tendency bias to), which is, the higher the behavior test score, the higher the degree of brain activation in DLPFC money-giving behavior is higher.