Delusional beliefs are typically pathological. Being pathological is clearly distinguished from being false or being irrational. Anna might falsely believe that his husband is having an affair but it might just be a simple mistake. Again, Sam might irrationally believe, without good evidence, that he is smarter than his colleagues, but it might just be a healthy self-deceptive belief. On the ot...

Irrational or illogical beliefs are referred to variously as magical thinking, peculiar beliefs, superstitious beliefs, and half-beliefs. We first distinguish the various terms according to their most common and relevant usage for consumer psychologists and define a conceptual structure for the roles of conscious and nonconscious processes associated with peculiar beliefs in decision-making. We...

Why do well-functioning psychological systems sometimes give rise to absurd beliefs that are radically misaligned with reality? Drawing on signalling theory, I develop and explore the hypothesis groups often embrace viewed as by outsiders a means of ingroup commitment. clarify game-theoretic underpinnings this hypothesis, contrast it similar proposals about functions beliefs, motivate several s...

A multi-attribute, stated-preference approach is used to value low and high impact actions on four major landscape components addressed by the Rural Environment Protection Scheme in Ireland. Several methodological issues are addressed: the use of prior beliefs on the relative magnitudes of parameters, standardized description of different levels of landscape improvements via image manipulation ...

The Multidimensional Scale of Irrational Beliefs (MSIB) is a brief and theoretically founded measure of irrational thinking as conceptualized by Albert Ellis in his most recent works on Rational Emotive Behavior Therapy (e.g., Ellis, 2003). With a total of 18 items, it captures demandingness, negative self-evaluation, and low frustration tolerance as the three core aspects of irrationality. Unl...

Belief polarization occurs when 2 people with opposing prior beliefs both strengthen their beliefs after observing the same data. Many authors have cited belief polarization as evidence of irrational behavior. We show, however, that some instances of polarization are consistent with a normative account of belief revision. Our analysis uses Bayesian networks to characterize different kinds of re...