Reciprocity plays a key role maintaining cooperation in society. However, little is known about the neural process that underpins human reciprocity during social interactions. Our neuroimaging study manipulated partner identity (computer, human) and strategy (random, tit-for-tat) in repeated prisoner's dilemma games and investigated the neural correlate of reciprocal interaction with humans. Reciprocal cooperation with humans but exploitation of computers by defection was associated with activation in the left amygdala. Amygdala activation was also positively and negatively correlated with a preference change for human partners following tit-for-tat and random strategies, respectively. The correlated activation represented the intensity of positive feeling toward reciprocal and negative feeling toward non-reciprocal partners, and so reflected reciprocity in social interaction. Reciprocity in social interaction, however, might plausibly be misinterpreted and so we also examined the neural coding of insight into the reciprocity of partners. Those with and without insight revealed differential brain activation across the reward-related circuitry (i.e., the right middle dorsolateral prefrontal cortex and dorsal caudate) and theory of mind (ToM) regions [i.e., ventromedial prefrontal cortex (VMPFC) and precuneus]. Among differential activations, activation in the precuneus, which accompanied deactivation of the VMPFC, was specific to those without insight into human partners who were engaged in a tit-for-tat strategy. This asymmetric (de)activation might involve specific contributions of ToM regions to the human search for reciprocity. Consequently, the intensity of emotion attached to human reciprocity was represented in the amygdala, whereas insight into the reciprocity of others was reflected in activation across the reward-related and ToM regions. This suggests the critical role of mentalizing, which was not equated with reward expectation during social interactions.
The importance of citizen deliberation in democracy is widely recognized today and the current digitalized and more fragmented society may benefit from discussions among people with diverse opinions in a well-organized setting. At the same time, concerns have also been raised about inequality in deliberative participation. We narrowed our focus to gender equality and examined whether introducing an evidence-driven style of deliberation can mitigate gender inequality in policy deliberation. In our repeated measure (within-subjects) experiment, university students in Japan discussed divisive policy issues during two sessions. Half of the participants started the discussion by examining factual information about the topic (evidence-driven style) and the other half started the discussion by expressing opinions about the topic (verdict-driven style). In the second session, the two groups switched styles. We found a statistically significant gender gap in participatory contribution for the verdict-driven style, but no such gap existed for the evidence-driven style. Using causal mediation analysis, we also found that, compared with the verdict-driven style, the evidence-driven style of deliberation reduces the gender gap by lowering women's tendency to agree with men. One possible explanation from the viewpoint of gendered communication is that women were more confident in evidence-driven deliberations. This psychological effect is a factor that is harder for facilitators to control and thus the evidence-driven style can be effective even with the presence of facilitators. This paper demonstrates the importance of studying how deliberations are conducted and how deliberation styles can affect the content and the consequences of policy deliberations.
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