In this paper we present the results of a simulation study of credence developments in groups of communicating Bayesian agents, as they update their beliefs about a given proposition p. Based on the empirical literature, one would assume that these groups of rational agents would converge on a view over time, or at least that they would not polarize. This paper presents and discusses surprising evidence that this is not true. Our simulation study shows that these groups of Bayesian agents (...) show group polarization behavior under a broad range of circumstances. This is, we think, an unexpected result, that raises deeper questions about whether the kind of polarization in question is irrational. If one accepts Bayesian agency as the hallmark of epistemic rationality, then one should infer that the polarization we find is also rational. On the other hand, if we are inclined to think that there is something epistemically irrational about group polarization, then something must be off in the model employed in our simulation study. We discuss several possible interfering factors, including how epistemic trust is defined in the model. Ultimately, we propose that the notion of Bayesian agency is missing something in general, namely the ability to respond to higher-order evidence. (shrink)

Fairness, the notion that people deserve or have rights to certain resources or kinds of treatment, is a fundamental dimension of moral cognition. Drawing on recent evidence from economics, psychology, and neuroscience, we ask whether self-interest is always intuitive, requiring self-control to override with reasoning-based fairness concerns, or whether fairness itself can be intuitive. While we find strong support for rejecting the notion that self-interest is always intuitive, the literature has reached conflicting conclusions about the neurocognitive systems underpinning fairness. We (...) propose that this disagreement can largely be resolved in light of an extended Social Heuristics Hypothesis. Divergent findings may be attributed to the interpretation of behavioral effects of ego depletion or neurostimulation, reverse inference from brain activity to the underlying psychological process, and insensitivity to social context and inter-individual differences. To better dissect the neurobiological basis of fairness, we outline how future research should embrace cross-disciplinary methods that combine psychological manipulations with neuroimaging, and that can probe inter-individual, and cultural heterogeneities. (shrink)

Andreas Christiansen,Bjørn Hallsson | : In many cases, the public want to restrict an activity or technology that they believe to be dangerous, but that scientific experts believe to be safe. There is thus a tension between respecting the preferences of the people and making policy based on our best scientific knowledge. Deciding how to make policy in the light of this tension requires an understanding of why citizens sometimes disagree with the experts on what is risky and what is (...) safe. In this paper, we examine two highly influential theories of how people form beliefs about risks: the theory that risk beliefs are errors caused by bounded rationality and the theory that such beliefs are part and parcel of people’s core value systems. We then discuss the implications of the psychological theories for questions regarding liberal-democratic decision making: Should policy be responsive to the preferences of citizens in the domain of risk regulation? What risk-regulation policies are legitimate? How should liberal-democratic deliberation be structured? | : Dans de nombreux cas, le public veut restreindre une activité ou une technologie qu’il croit être dangereuse, mais que les experts scientifiques considèrent être sécuritaire. Il y a alors une tension entre le respect des préférences des gens et des politiques fondées sur nos meilleures connaissances scientifiques. Décider comment élaborer une politique à la lumière de cette tension nécessite de comprendre pourquoi les citoyens sont parfois en désaccord avec les experts à propos de ce qui est risqué et ce qui est sûr. Dans cet article, nous examinons deux théories très influentes sur la façon dont les gens forment des croyances sur les risques : la théorie selon laquelle les croyances liées au risque sont des erreurs causées par la rationalité limitée et la théorie selon laquelle ces croyances font partie intégrante des systèmes de valeurs fonda-mentales des personnes. Nous discutons ensuite les implications des théories psychologiques pour les questions touchant la prise de décision libérale-démocratique : Les politiques devraient-elles être sensibles aux préférences des citoyens dans le domaine de la régulation des risques? Quelles politiques de régulation des risques sont légitimes? Comment la délibération libérale-démocratique devrait-elle être structurée? (shrink)

The aim of this chapter is to examine how diversity benefits deliberation, information exchange and other socio‐epistemic practices associated with free speech. We separate five distinct dimensions of diversity, and discuss a variety of distinct mechanisms by which various forms of diversity may be thought to have epistemically valuable outcomes. We relate these results to the moral justification of free speech. Finally, we characterise a collective action problem concerning the compliance with truth‐conducive norms of deliberation, and suggest what may solve (...) this problem. (shrink)