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The computational and neural substrates of moral strategies in social decision-making.

ABSTRACT: Individuals employ different moral principles to guide their social decision-making, thus expressing a specific 'moral strategy'. Which computations characterize different moral strategies, and how might they be instantiated in the brain? Here, we tackle these questions in the context of decisions about reciprocity using a modified Trust Game. We show that different participants spontaneously and consistently employ different moral strategies. By mapping an integrative computational model of reciprocity decisions onto brain activity using inter-subject representational similarity analysis of fMRI data, we find markedly different neural substrates for the strategies of 'guilt aversion' and 'inequity aversion', even under conditions where the two strategies produce the same choices. We also identify a new strategy, 'moral opportunism', in which participants adaptively switch between guilt and inequity aversion, with a corresponding switch observed in their neural activation patterns. These findings provide a valuable view into understanding how different individuals may utilize different moral principles.

SUBMITTER: van Baar JM

PROVIDER: S-EPMC6445121 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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The computational and neural substrates of moral strategies in social decision-making.

van Baar Jeroen M JM Chang Luke J LJ Sanfey Alan G AG

Nature communications 20190402 1

Individuals employ different moral principles to guide their social decision-making, thus expressing a specific 'moral strategy'. Which computations characterize different moral strategies, and how might they be instantiated in the brain? Here, we tackle these questions in the context of decisions about reciprocity using a modified Trust Game. We show that different participants spontaneously and consistently employ different moral strategies. By mapping an integrative computational model of rec ...[more]

PMID: 30940815

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Project description:Animal approach-avoidance conflict paradigms have been used extensively to operationalize anxiety, quantify the effects of anxiolytic agents, and probe the neural basis of fear and anxiety. Results from human neuroimaging studies support that a frontal-striatal-amygdala neural circuitry is important for approach-avoidance learning. However, the neural basis of decision-making is much less clear in this context. Thus, we combined a recently developed human approach-avoidance paradigm with functional magnetic resonance imaging (fMRI) to identify neural substrates underlying approach-avoidance conflict decision-making. Fifteen healthy adults completed the approach-avoidance conflict (AAC) paradigm during fMRI. Analyses of variance were used to compare conflict to nonconflict (avoid-threat and approach-reward) conditions and to compare level of reward points offered during the decision phase. Trial-by-trial amplitude modulation analyses were used to delineate brain areas underlying decision-making in the context of approach/avoidance behavior. Conflict trials as compared to the nonconflict trials elicited greater activation within bilateral anterior cingulate cortex, anterior insula, and caudate, as well as right dorsolateral prefrontal cortex (PFC). Right caudate and lateral PFC activation was modulated by level of reward offered. Individuals who showed greater caudate activation exhibited less approach behavior. On a trial-by-trial basis, greater right lateral PFC activation related to less approach behavior. Taken together, results suggest that the degree of activation within prefrontal-striatal-insula circuitry determines the degree of approach versus avoidance decision-making. Moreover, the degree of caudate and lateral PFC activation related to individual differences in approach-avoidance decision-making. Therefore, the approach-avoidance conflict paradigm is ideally suited to probe anxiety-related processing differences during approach-avoidance decision-making.

Project description:While extensive research has been conducted on adults' judgments in moral sacrificial dilemmas, there is little research on adolescents. The present study aimed at: (1) adding further empirical evidence about adolescents' moral decisions (deontological vs. utilitarian) in sacrificial moral dilemmas and (2) investigating how these moral decisions relate with gender, school grade, emotional traits (callous-unemotional traits), context-related experiences (perceived parental rejection and community violence exposure), and moral-related factors (moral disengagement and universalism value). A sample of 755 Italian adolescents (54.7% females; Mean age=16.45, SD=1.61) attending the second and the fifth year of secondary school took part in the study. Two sacrificial trolley-type dilemmas (where harmful actions promote the greater good) were presented. In the "switch" scenario (impersonal sacrificial dilemma), the choice is whether to hit a switch to save five people killing only one person. In the "footbridge" scenario (personal sacrificial dilemma), the choice is whether to push a large man off a footbridge saving five persons. For each scenario, participants had to indicate whether the proposed action was "morally acceptable" or not. Data were analyzed performing generalized linear mixed models. Our results showed that: (1) Adolescents were more likely to indicate as admissible to hit the switch rather than to push the large man; (2) male adolescents, compared to females, were more likely to say it was morally acceptable to intervene in the footbridge dilemma, whereas younger adolescents said it was morally acceptable both in the switch and the footbridge situations; and (3) higher levels of callous-unemotional traits, perceived parental rejection, and moral disengagement, on the one hand, and lower levels of universalism, on the other hand, were associated to higher admissibility to intervene in the footbridge scenario. Higher community violence exposure was associated with a lower propensity to intervene in the switch scenario. Overall, the present study expands the research on sacrificial dilemmas involving a sample of adolescents. The findings support previous studies concerning the role of emotions in making moral decisions but, at the same, open new perspectives regarding the role of contextual experiences and moral-related factors.

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The computational and neural substrates of moral strategies in social decision-making.

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The computational and neural substrates of moral strategies in social decision-making.

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