How peer influence shapes value computation in moral decision-making

Yu, H., Siegel, J., Clithero, J., & Crockett, M. 

(2021, January 16).

https://doi.org/10.31234/osf.io/hg79v

Abstract

Moral behavior is susceptible to peer influence. How does information from peers influence moral preferences? We used drift-diffusion modeling to show that peer influence changes the value of moral behavior by prioritizing the choice attributes that align with peers’ goals. Study 1 (N = 100; preregistered) showed that participants accurately inferred the goals of prosocial and antisocial peers when observing their moral decisions. In Study 2 (N = 68), participants made moral decisions before and after observing the decisions of a prosocial or antisocial peer. Peer observation caused participants’ own preferences to resemble those of their peers. This peer influence effect on value computation manifested as an increased weight on choice attributes promoting the peers’ goals that occurred independently from peer influence on initial choice bias. Participants’ self-reported awareness of influence tracked more closely with computational measures of prosocial than antisocial influence. Our findings have implications for bolstering and blocking the effects of prosocial and antisocial influence on moral behavior.

Response time modelling reveals evidence for multiple, distinct sources of moral decision caution

Andrejević, M., et al. 

(2020, November 13). 

https://doi.org/10.31234/osf.io/fa57h

Abstract

People are often cautious in delivering moral judgments of others’ behaviours, as falsely accusing others of wrongdoing can be costly for social relationships. Caution might further be present when making judgements in information-dynamic environments, as contextual updates can change our minds. This study investigated the processes with which moral valence and context expectancy drive caution in moral judgements. Across two experiments, participants (N = 122) made moral judgements of others’ sharing actions. Prior to judging, participants were informed whether contextual information regarding the deservingness of the recipient would follow. We found that participants slowed their moral judgements when judging negatively valenced actions and when expecting contextual updates. Using a diffusion decision model framework, these changes were explained by shifts in drift rate and decision bias (valence) and boundary setting (context), respectively. These findings demonstrate how moral decision caution can be decomposed into distinct aspects of the unfolding decision process.

From the Discussion

Our findings that participants slowed their judgments when expecting contextual information is consistent with previous research showing that people are more cautious when aware that they are more prone to making mistakes. Notably, previous research has demonstrated this effect for decision mistakes in tasks in which people are not given additional information or a chance to change their minds.The current findings show that this effect also extends to dynamic decision-making contexts, in which learning additional information can lead to changes of mind. Crucially, here we show that this type of caution can be explained by the widening of the decision boundary separation in a process model of decision-making.

Is fairness intuitive? An experiment accounting for subjective utility differences under time pressure

Merkel, A.L. & Lohse, J. Exp Econ (2018).
https://doi.org/10.1007/s10683-018-9566-3

Abstract

Evidence from response time studies and time pressure experiments has led several authors to conclude that “fairness is intuitive”. In light of conflicting findings, we provide theoretical arguments showing under which conditions an increase in “fairness” due to time pressure indeed provides unambiguous evidence in favor of the “fairness is intuitive” hypothesis. Drawing on recent applications of the Drift Diffusion Model (Krajbich et al. in Nat Commun 6:7455, 2015a), we demonstrate how the subjective difficulty of making a choice affects decisions under time pressure and time delay, thereby making an unambiguous interpretation of time pressure effects contingent on the choice situation. To explore our theoretical considerations and to retest the “fairness is intuitive” hypothesis, we analyze choices in two-person binary dictator and prisoner’s dilemma games under time pressure or time delay. In addition, we manipulate the subjective difficulty of choosing the fair relative to the selfish option. Our main finding is that time pressure does not consistently promote fairness in situations where this would be predicted after accounting for choice difficulty. Hence, our results cast doubt on the hypothesis that “fairness is intuitive”.

The research is here.