Are the Autonomic and Central Neurophysiological Correlates Predictive of Moral and Economic Offers?

Objective: Previous neuroscientific research explored howboth moral values and economic scenarios can influence individuals’ brain activity. This study investigated the relationship between peripheral and neural activity during fairness and unfairness perception in moral and economic conditions. Method: Thirty-one participants underwent a modified version of the Ultimatum Game, which proposed various offers (fair, unfair, equal) concerning two different contexts: economic and moral conditions. During the task, the peripheral (heart rate [HR], skin conductance level/response [SCL, SCR]) and central (oxygenated and deoxygenated hemoglobin [O2Hb, HHb]) individuals’ responses were recorded using the autonomic indices recording and functional near-infrared spectroscopy. The peripheral activity was correlated with motivational systems (Behavioral Inhibition/Activation System[ BIS/BAS]) and individuals’ personality traits. Results: Findings highlighted a positive correlation between SCL and O2Hb in the dorsomedial prefrontal cortex (dmPFC) during fair, unfair, and equal offers in the economic condition and a negative correlation between SCL and O2Hb in the dmPFC for fair and equal offers in the moral condition. Also, HR negatively correlated with HHb in the dorsolateral prefrontal cortex during the presentation of equal and unfair offers in the economic condition. Finally, correlations between SCL and BAS subscales (Drive and Fun Seeking) and SCR and emotional stability trait suggested the link between motivation and emotional regulation during different conditions. Conclusions: In conclusion, the relationship between autonomic, central activity, and motivational and personality traits in moral and economic offers’ condition was discussed in light of different brain networks supporting these processes